I can't be much help here, but -
Marquee- Lexan, Lucite, or glass?
Might get more response in the artwork forum.
Bezel- Lexan, Lucite, or glass? Tinted?
Tinted. Been asked before. Opinions vary. Do a search. I remember OldSkool and RandyT having comments on it.
Display- 24" flat screen or 27" regular tv?
Might get more response in the monitor video forum.
Control panel- how many buttons per player? What layout?
I recommend 7 buttons (but maybe six inputs) in an ergonomic modified SF/neo-geo layout as attached.
either the top or bottom row can be 1-3.
The thumb button should be either one of the lower row or upper row buttons, depending on which row you want to use for 4-button games.
Personally, I would go with
4 5 6
1 2 3
6