Thanks to you all for the great comments. For my next version, it quite needs a ceiling. And needs some bogeys (I think when i saw them, there quite identical to the Amtrak Amfleet bogies).
@Dr. Subway18, I'm not very sure if u are quite capable of Exterior making (with or without DJ Hammers), but hopefully, if u be able to find the bogeys identical to the Amtrak Amfleet cars, I'll be a lot happier.
Also, I saw in DJ Hammers' sig that links me to a contribution page (where anyone want to signup/help with the creations), but how does it exatly...work? I mean while I almost finished with this project, I'm starting another Subway project for both OpenBVE and Trainz called "Project: BART" (You do know what BART stands for).