I've been (and am currently) out of town since July 28, but I just went through the e-mails and didn't see your's there. I just got the missing cable for my laptop so I could connect and answer everything. Anyway here are the answers to your questions.
1. At the sight tower it is .75", at the muzzle it is .70".
2. Chrome lining is currently available on EM-4's, 11.5", 16" commando's, and soon to be available on the 20" kits, but not on the lightweight tacticals at this time.
3. It could be substituted for no extra cost.
4. The M-44's will be available for a $110 upgrade.
5. I won't have a catalog to look up the weight on that kit until Thursday. Sorry.