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The Hi-Zack first appeared in Zeta Gundam, the first in a long
long line of Zaku upgrades, and a striking design (despite the
fact that it's really just Gundam MK-II fodder). Years ago I built
the 1/100 scale Hi-Zack from the Zeta Gundam model series. It
was a nice kit, as were most of the 1/100 models from that series,
but had some flaws. The head is just plain awful, the articulation
is poor, and those darn rubber power cables are ugly and unpaintable.
After years of thinking about it, I've built the Hi-Zack I've
always dreamed of, a mean looking, well articulated, Master Grade
style Zaku worth of the name Hi-Zack. :)
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Construction
This model has been heavily reworked, I'd say it's about 30% scratchbuilt.
Nearly all of the joints were rebuilt, power cables were replaced,
most of the arms are scratchbuilt, a much needed facelift was
given, and a lot of details were added. Here's the breakdown...
Head
The most glaring problem with this model is the face. I looks
pinched up and wimpy, Grandma's MS. :P The first picture shows
the ugly snout, and also the scratchbuilt monoeye detailed below.
The solution was a new snout. I glued the halves of the head together,
then sawed off the existing face before figuring out how to build
a new one, which forced me not to give up on the problem.
The basic snout shape was simple enough. I built
it from plastic sheet and Bondo polyester putty, with a ridged
plastic sheet cut to shape for the vents at the front. This was
glued to what was left of the head, and faired in with spot putty.
The hard part was recreating the oval shapped extrusion
that goes across the simple snout shape. I ended up using 2 different
diameter plastic tubes, gluing them together, then filling the
space in between with Bondo (using a plastic sheet to create a
flat surface). This gave me the oval crossection that I needed.
Rather than try to carve the required cutout into this fragile
part, I made a resin copy, then carved out the underside so it
would fit the snout. I then added cable mounts (cut from plastic
tube), and the little bump at the top (plastic sheet and putty).
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The kit just comes with a decal for the monoeye.
I scratchbuilt a detailed monoeye, using several sizes of plastic
tubing, some turrets sliced off of an old SDF-I model, and a Wave
H-Eye (back painted with silver).
I also cut out the recessed part in the back of
the head and made a part from Bondo with details to match the
lineart, but somehow didn't end up with pictures of that.
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Torso
The whole torso came molded in just two parts (front and back),
with no articulation at the waist or skirts (save the side skirts).
I chopped up the whole thing so I could add much needed articulation.
After I had seperated the skirts, waist, midsection,
and upper torso, I scratchbuilt a new midsection from plastic
sheet and Bondo polyester putty. It took quite a bit of work to
get the contours right, but I'm happy with the result. This was
attached to the upper torso with a large ball joint (adding some
limited articulation), and to the waist with a brass tube.
I backed the skirt pieces with plastic sheet, and
detailed them to simulate reinforcing braces. I ended up painting
the inside of the skirts bright red, which looks really cool,
but you can barely see them on the finished model.
After cutting everything up, I ended up with no
place to attach the skirts, so I added mounts for them to the
waist using plastic sheet smoothed out with Bondo. The skirts
were attached with small springs after painting.
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Arms
Between the poor joint design and rubber power cables, the arms
of the original kit were left with just about zero articulation.
I wanted a lot more motion than that, and I've never seen a Hi-Zack
model that properly replicated both the look and movement of the
arms (most versions just leave off the power cables!). I originally
came up with a joint system that had a ball joint at the top of
the elbow (shown at left), but it didn't look particularly good,
and the movement gained didn't justify the aesthetic sacrifice.

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I ended up using a joint system like the one on the Master Grade
Zaku's. First, I built a new bicep part by constructing a mold
from plastic sheet, then filling it with Bondo putty. I sawed
off the rounded bottom of the original bicep, and made a half
circle elbow connecting joint, using a T shaped polycap to plug
it into the bicep. A brass rod is attached to the bottom of this
part, which plugs into a large polycap in the forearm (held in
place with more Bondo). The bicep plugs into the shoulder part
with another polycap and plastic peg.
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I decided I didn't like the soft look of the squared off parts
of the forearms, so cut them off and replaced them with parts
built from styrene sheet. This also added a sectioned armor look,
which is nice. This required adding a support between the two
halves, also from plastic sheet. I took this opportunity to goop
some Bondo in the elbow to hold the polycap that attaches to the
upper arm. These ended up a little wider than the original arms,
so I widened the gray part and filled the cut out (that was supposed
to allow the elbow to bend, but didn't do any good) with plastic
sheet as well. The power cables in the forearms were replaced
with some elastic strings that had the right crosshatch texture,
which are plugged in to short slices of brass tubing (the power
cables coming from the torso plug in to the other end of these
tubes, inside the elbow).
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