Just take the wheels off the casters be4 u burn-in. If you use an air diffuser plate in the bottom, the rubber wheels should be fine under normal usage. You might want to consider bottom air feed too. As for lid. I'd probably just cut a circle into some plate steel.
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Dr. Mark (STL)
Ph.D. (honorary) Bovine $hitology
A thin line separates paranoia from an acute understanding of reality.
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