For the past few weeks, I've been building up a long box 18" AMT Starship Enterprise kit as the USS Constellation from the episode "The Doomsday Machine". The reason I am using a long box kit is because it is the proper tooling to use for this model (the original 1966 vintage tooling wore out by 1975 and the tooling used after that was almost totally different).
Using the screen captures I've found here (mainly in the AMT studio model thread), I've tried to add the proper battle damage in spots, using what I've seen in those images to guide me. This won't be a 100% exact replication and indeed I may go a bit more detailed on the paintjob and the decals, but it is certainly in the spirit as my damage areas are being made with stretched sprue, styrene bits and aluminum foil, as that looks like what the effects house used back then.
In any event, I've uploaded three in progress videos to youtube detailing my work (with inspiration from Steve's "The Enterprise Project") as it were. So have a look if you want!
18" USS Constellation Project (part 1) - YouTube
18" USS Constellation Project (Part 2) - YouTube
18" USS Constellation Project (Part 3) - YouTube
I'll be uploading still photos of the conversion soon as well as I have been shooting a few during the build.