Control Panel Overlay Question

[LiquidFire]

How thick is the *thickest* custom overlay material you can get? Seems from what I have been reading here, some are pretty thin and unforgiving as far as imperfections in the underlying cp substrate.

I am concerned that even though my cp parts, such as the joystick plate and trackball plate, will be 'flush', the overlay material may show the mountings anyway if not thick enough.

I will sand and fill and even primer the cp before covering, but I want to see *nothing* in the overlay where it should not be.