Re: head tube replace
For future information, welding the steer tube is a pain to get right. I chopped a 1" steer tube to insert in a 1-1/8" tube (which fits really well) and extended it by 20mm. Not much of an extension, but it's what I needed. Getting the two pieces perfectly aligned is difficult to say the least. It takes a lot of patience, small tack welds, and a lot of straight edge checking.
If you don't do that, you will end up with a banana shaped steer tube, which doesn't roll too well inside the head tube.
Nice score on the Kent. Just FYI, I know a lot of people poo poo on the idea of aluminum frames, but so long as the engine is properly mounted you will have a long life out of it without issue.