Update...
Sorry for the delays in posting any progress updates. I got sidetracked last weekend working on installing a neighbor's kitchen faucet and dealing with the plumbing problems that ensued so haven't spent as much time as I might on this build. Here are some of the latest developments...
After masking the windows and lights on the secondary hull and priming with Duplicolor I noticed the seams needed a little more attention so there followed a few more rounds of puttying and sanding until I got them where I liked them:
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IMG_4622 by trekriffic, on Flickr
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IMG_4623 by trekriffic, on Flickr
You can see the shuttle bay doors in their closed configuration in the these pics. I made the center section removeable. The fit is so precise that the doors stay in place with just a friction fit and with the lights on there are no light leaks between the cracks. I probably spent 4-5 hours altogether just working on the doors to get them right.
For the neck I had previously sprayed it with my custom "concrete" base color. Then I went back and sprayed the leading edge with MM Hellblau:
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IMG_4627 by trekriffic, on Flickr
Hellblau is an interesting color. It's kind of a blue-green gray which leads me to believe that's why some folks think it's greenish and some think it's bluish; actually it's both!
The neck was glued to the secondary hull. The seam was filled with AVES Apoxy Sculpt:
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IMG_4628 by trekriffic, on Flickr
The AVES went on so smoothly that I shouldn't need to do any sanding at all but I'll probably give it a once over with 600 grit just in case.
Next, I came up with an idea for the impusle engines involving this cheap Dollar Tree push light:
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IMG_4655 by trekriffic, on Flickr