Wow, lovin this build. Definitely subscribing to the thread.
One question, how thick is the stuff you're using? I think that will be my foam of choice for my build since it's not convenient to get out to where Michaels is from where I live because we never go out that way, but we got to Wal-Mart every other week.
Oh and I should have put this first, that is one of the most accurate Mark III builds I've seen from foam. Actually it's the only if truth be told. Don Robert's made IV and VI.
Best of luck,
Shade