ok, for the front, get another peice of plywood and cut it out like so:


Then throw on some acrilyc doors like so:


I like to seal the edges with sylicone. If you decide to paint it make sure to use a latex paint. They look nice and are non toxic.

Looks good so far!

edit:
oh and robert has a good idea with the adheasive tiles. I did that with the entire inside of my frog enclosure and cyliconed the seams (frog need high humidity which can screw with wood). I have had several people think it was professionaly done. It looks great.
*toots own horn*