One more decision done: I tried to convince Dan Wesson to build me a Valkyrie Commander in 10mm, but they won't do it on an aluminum frame. I think during my sabbatical I will attend a top-quality 1911 building program, then just do it myself.
From what I understand none of the 1911 classes will let you work with aluminum frames. Usually it's all 5" and steel. Who sells a 1911 alum frame for you to build upon?