Need some of y'alls creative thinking!

I recently purchased a Rzr this weekend and am wanting to do a little DIY project on the dash. I have a radio coming in for it, so I had an idea that I wanted to do. I'm wanting to make a door (because the 900 doesn't come with a waterproof door) for the cubby hole in the dash. I want to make a door where I can slide a phone in and out, and use it as a touchscreen (Like some people do with their iPads in the dash). I'd like to keep the small room behind the door to toss some small stuff in, but I've also thought about using some hard styrofoam to counter sink the phone into and sliding into the cubby hole. I've never worked with fiberglass, but was thinking maybe trying something that way.

Cubby Hole!
https://www.google.com/search?q=rzr+900s+cubby+hole&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0CAgQ_AUoAmoVChMIu_qxitOVyQIVCTgmCh19hAV8#imgrc=78Cyn75nBOzm1M: