little info i learned researching my project. i'm doing my for sq though...
if your set on doing 2 mids(playing the same freq) you need to have them on the same plane and the same distance from your ear, or else you'll end up w/ tons of cancellation. if you wanna do 2 mids do one for say 80-400hz and one for say 400-2500hz, that way they're not fighting each other. i opted for one, nice pair.
as for stretching fleece. i start by stretching over all the rings, the work my way around the 'panel' in a circle. just pull it tight and get rid of any wrinkles.