As I have noted numerous on this forum, I know sweet-bugger-all about the technical aspects of electronics. I usually depend on you & Simon to edumacate me on such matters.
So my question is why are you looking to use MDF when you can blank turret boards for what seems like a very reasonable price to me? (Evatco)
This was my first thought even with my low level understanding of amplifim-ma-cation and electricity.There is also a much greater fire risk with MDF than say glass fibre.