This is going to be a silly question but I have to ask anyway.

For soundproofing (or at least trying to reduce the sound at all!) I plan on building a wooden box with a shelf in the middle.  I'd put the S9 on the middle shelf with exhaust facing towards the back and have a cutout for the fan to fit into so the heat exhaust goes into a compartment that gets sucked out with a fan into some ducting to dispose of.  On the bottom half of the box I'd put the power supplies.  For air intake I'd put a house filter over a hole that I'd use as air intake.  I'd then place that entire box inside another box that would be completely surrounded by insulation so I can muffle the noise.

If that makes sense here is my question.  Would I have a problem just stetting the miner/power supply on the wood itself or should I get some sort of spacer to set them on between the item and the wood. 

Any suggestions or tips before I head to home depot and get the supplies to make this?