Ummm JT... you are making the first mistake of building a UDS.. no worries, all of us do it... YOU ARE OVERCOMPLICATING IT... Build the thing as close to the basic UDS as you can with the materials at hand and then make the mods as you learn. there is nothing in your "hit list" that cant be added later. If something doesnt work, you will be more able to track down your problems if you make one change at a time.
"Assumption is the Mother of all F___ups!"