I was in the process of drilling out all the holes on an aluminum tube, but gave up when my day job work took too much time from me to keep a steady pace. You know that kind of job where you say; "This is crazy, why am I continuing to push forward" before you know it, you're knee deep in it with no compass.

Yes. I have full insulation just like the steel ultra-flo's.
Muffled the car down a bit much. "Something the boys in Detroit should have thought of when they built the "Silver Bullet" but the types of aluminum that we have today were not available to the general public back then.
My aluminum system is a slip on and well attached and clamped to a few points along the chassis. Dumps just before the axle.
I laid on my back for the mock ups as well. Not for the LIGHT hearted. LOL.

Good luck and try to document the progress with flicks.