Yoop: FWIW, the method you describe above would be OK in my opinion as an inspector. Alum. siding is not very prevanant here (NJ), but I have run accross a few metal skin structures lately. Where the 'skin' mechanical connection to the metal framing was compromised, lugs and #6 were installed. I commented earlier (page 1) as to my opinion, and I'll stick with that comment also.
