What material is best to go behind windows on light up models?

Hello!

I'd say paper!

Good luck with your build and have a nice day

Paweł

White 0.010" styrene sheet will work.  I have also been tinkering with my first lighting project, and I found that the white plastic will prevent see-through into the model, conceal the yellow SMD chip color, and eliminate the "JJ Abrams lens flare effect".

If you color the sheet plastic front or back, you can use a single light source for different colors.  I colored the backsides the tail lights of Halcyon's Aliens APC with a cyan felt marker:

https://flic.kr/p/CbmLTb][/url]APC-52 by N.T. Izumi, on Flickr

https://flic.kr/p/BTNUTC][/url]APC-54 by N.T. Izumi, on Flickr

Good luck on your Enterprise - you certainly have WAY more lights to do than I do!  I have a JJ-Prise model that I want to light, so I'll be watching your progress to crib ideas!

I used tissue paper on my Trek kits.  It worked very well.

I know many people have use nail (dental) acrylic to fill in the holes of Trek ships windows. Its an epoxy like mateial that dries opaque/clear. You block the outside part of the window with tape and on the inside you add drops of this material to fill the holes. Let dry, remove tape.

For windows I have also used (not on Trek ships) glass microscope cover slips, clear styrene, and acetate  sheets (think overhead projector transparencies). For opaque look spray with something like Testors Dullcoat.

Here's one for you !

  I have for years used Waxed paper ( the heavy kind  , It diffuses the light  better  ). I have also frosted the ends of the Fiber optic material with 600 grit sandpaper ( wet )  T.B.

Hey guys, thanks all of you for your suggestions they have defintely been useful!

All I need to do next is get the right kind of paint for my new paint sprayer and prep the model for drilling :)

Cheers