I built my box out of 3/4" MDF and had a 3/4" plexi-glass cut and drilled with countersinks every 3". Do I just screw the plexi to the box or do I add some sort of gasket in between it, like foam weatherstripe since I don't want to crank down the plexi and risk cracking it? If I add the weatherstripe, how thick should it be? 3/4"? 1/2"?