Wow guys! Thanks for the great response!
Let me try and tackle the questions without going back and quoting everyone.
First, all the tubing is 3/8" and sturdy at .035 wall.
The blow-off port is flush with the bottom of the cap.
The racking arm extends to the very bottom of the keg and can be removed while the clamp is in position.
Someone sent me a link to the St Pat's model while I had this in development to ask if mine would be similar. I thought the expense of the Tri-Clover fitting for the single purpose of attaching a hose was pretty silly and not worth the extra money. I do not, however, have a pressure release valve and do not recommend using this to pressurize the vessel. 1-2psi to initiate a transfer shouldn't be any trouble.
I'm putting these on the new site (I'm changing stirplates.com to BrewersHardware.com since it's more fitting) and they'll run $79 with clamp and gasket. Since I've had such great support from HBT users overall, I'm going to do a pre-sale deal of $65 through this link only: Welcome to Brewer's Hardware
The link is live, the new site is live but wasn't quite ready to go up. If you see a any typos, broken links or something that makes me look like an idiot I'd appreciate a note! If you cruise the site, don't order through the fermenter page as it'll come up $79. please use the HBT link.
I'll give the thermowell-less version some thought. I think in the long-run you'll be happy it's there but admittedly it's a difficult piece to weld (for me). I will be introducing a BrewTroller version that will replace the thermowell with a 14" DS18B20 sensor in another compression fitting. If you really want one without a thermowell, PM me. I think it'll knock about $20 off the price.
Last I'd just like to say thanks to everyone here. I get more referral traffic to stirplates.com from HBT than the rest of the sources combined. If it weren't for you guys (and the pursuit of great beer!) I wouldn't have been inspired to evolve stirplates into Brewer's Hardware.
Edit: That link to the special page will be live until 8/1. Also, if the link resolves to the 404 page on stirplates.com. try it again in 24 hours. i just finished all the DNS changes and such a few minutes ago.