It's not as complex as the version of this in Last Call BBS. That's to this game's detriment. It's just not interesting enough without the finer control and challenge that the Last Call BBS game has.
I love how you can use masking tape to paint your kit in Last Call BBS like we do IRL, the only thing we CAN'T do is adding panel lines and altering parts' shape, you know... the real custom build.