It's well-documented that I'm not too fond of HSS (both looks and what it does for me soundwise), but that looks pretty good sir! :D
Interesting about the chambering. Same as Philly, I'd like to know if it makes much difference as well. In my experience, on strats, quite loud acoustically is a good thing.
Don't worry too much about the switch - getting extra switches onto a strat guard is always a pain. I used to have one, and I think we put it between the two tones (but I only use one tone, anyway). Yours doesn't look too bad, then again I use my little finger rather than my palm to roll it. My guess is that switch is a little in the way, but you'll soon get used to it (and then you'll replace the guard to put the switch where you think it should be, and that'll feel wrong too! :lol:)