Picked up some spare doors and a thought occurred to me: How important is retaining the window frame? I figure if the lower portion is boxed with 1x1 it should be sturdy enough to support its own weight... which isn't much since it's an empty half door: no speaker, window etc.
Plus it'll only get 12 ounces heavier from time to time...
>>Dan
I think most people retain the frame for aesthetic reasons. I removed the door frame from mine and they seem plenty rigid and sturdy. Just preference.