Regarding the decals, if you can make up your artwork in Adobe Illustrator or Corel Draw this guys can print it for you for $10.00 a sheet ( Standard decal size).
http://elstrains.com/
I've just dealt with him and the print quality is very good (Actualy better then some Alps stuff i've seen) and he can print white ink altought he doesn't use the Alps system. The decals are all in one block and will requier endividual triming but i always do that. I have not had the chance to test them yet but they look very thin and I don't know how translucent they might be so getteing two sheets might be a good option. Great service too.
Check him out.