If the cab is a dedicated MVS Big Red, then the cab will be wood, but the control panel will be made of metal. I found that out when I just got my Big Red.
In that case, if you get Happs they will stick out a little longer then they usually would on a wooden control panel. I don't know about the rest of you guys, but to me that's bad.
The Happ Competition, the one I like to use, as well as the Super comes with three grooves on the metal stick, one groove is for a wooden control panel another for metal. But I can't, for the life of me, get the stick to push far dawn enough to reach the third groove. I could never do that either with my sticks that use Happs that I play with consoles. Why in the world they would make three grooves, and only two are usable, is beyond me. If anybody has gotten to that third groove, the one closest to bat top, I would appreciate it if they'd tell me about it.
I have to figure out some modification so as to lower the joysticks a little.
Anyways, if the control panel is metal, there a lot of possibilities open to you. If it is wood, I think you would need some modification to use jap sticks.