Looking good! My styrene tips,
#1 - Get a metal ruler so you can get nice lines
A paper cutter for scrap booking works really well too.
#2 - Super glue sucks ass IMO, I went with Perma Poxy 5 minute Plastic Weld. Its at Walmart and its in a pink and black package, costs aboot $8. I <3 Plastic Weld
#3 - Try and find a Testors razor knife, really cheap and I it has a really nice tip at the end of the blade
Heres a pic of all the tools listed above
Hope that helps
Andrew