Regarding compound miter saws. No such thing as a good and inexpensive one. If its a one time use thing for you. Ryobi or Delta. If you want a saw that can take a beating (tools thrown on top of, etc) and still be within a 1/4 degree of accuracy in a few years. I loved my last couple Hitachi saws. And lastly, The DeWalt 12" saw has been good to me so far. Its truely not old enough to tell the "test of time". Bleedinthought makes an excellent point about the ability to make a bigger cut with a 12". You cant cut a miter on a 2x6 with a 10" saw without flipping the board.
Are you building the whole face of the stand out of one sheet of plywood? If so you likely wont have a choice but to run the grain vertical unless you can special order a sheet with the grain opposite of normal. If you do use plywood, your idea of using your cuttouts for the doors will work like a charm. Cut clean, use some trim to hide the cuts and viola' your done. Bleedingthoughts magnet holds will work great with that one as well.
Are you building the whole face of the stand out of one sheet of plywood? If so you likely wont have a choice but to run the grain vertical unless you can special order a sheet with the grain opposite of normal. If you do use plywood, your idea of using your cuttouts for the doors will work like a charm. Cut clean, use some trim to hide the cuts and viola' your done. Bleedingthoughts magnet holds will work great with that one as well.