The front triangle and chainstays are brazed up. I weighed it with the uncut seatstays and it came out to 4 lbs. 1 oz. So the final weight will be well under 4 lbs.
Dimensionally, it came out spot on.
Just starting to conceptualize the tail light mount. It will be threaded to accept the fender mount screw through the "brake" bridge. It will be removable, for when a rack is mounted. I bought a cheesy little tube bender from HF, and it bends the stainless tubing quite well!