I was going to use Plexiglass to seal up the holes in my door panel in preparation for eventual deadening. I also have some steel plates, about 1/16" or 1/8" thick.
I got the metal plates free, so I was going to use them. But I wasn't sure if plexiglass might be better for sonic purposes.
Also, Home Depot has plexiglass in 1/10" and 1/4". The 1/4" is more than twice the price. Is the 1/10th good enough for sound deadening?
I figure this is just to give the Raamat something solid to sit on, but it'll be a while before I put the mat down so I'm hoping just blocking up the holes and dropping in some egg crate foam will help some for the time being.