Masonite/Supadoor would be fine in my opinion. You may look at a Trustile MDF door as well as a real stile and rail door will be more stable than a drop routed door (one piece of MDF that is carved). And please do your self the favor of upgrading the butt hinges. The standard off the shelf prehung door hinges are a cheap pot metal type hinge with a crappy brass plated finish. Also and this is my opinion but find a lumberyard or real building material supply house and not a box store for any millwork. This post was edited by millworkman on Sat, Jan 31, 15 at 8:42

I like choice #1 better than #3 or #4, both of which I've seen too often. Also, the horizontal elements never line up with anything, including door hardware. If you are looking for something that coordinates with your wainscoting, then you might prefer #4, but if that is in a hallway, I would not give it that much consideration.

Thanks GN Bulders, I going to use the solid core door for the top piece only! The Entertainment Center will be very heavy if I use all MDF! LOL! I will get a two 12" X 2" and place them side by side for the bottom piece with dows to attach them in place and wood glue and clamps. The middle level wil be the 1" wood boards from scrape pieces sectioned off into 20" wide . I looking at maybe using the scrap 4" X 4" for legs. All will be screw together and use framing L braces that are rated at 5,000 lbs. Have not decided if I want to have it a close box or just open yet! I can get components like glass shelves from my two entertaiment systems that I going to junk!

My last house had one panel shaker doors, pine stiles and rails with mdf center panel. They were either from Masonite or Tucker. Held paint beautifully.