small update: Well, at least it hasn't caught on fire. Final price for the tubing and Ts came out to around $10, $11 which isn't too shabby. My 1.2T-bird heat factory now idles at a balmy 39-40c, and under an hour or so of load made it all the way up to 44c. But - woohoo! - the temp actually goes back DOWN once it's under idle again (novel concept for a bucket person). All pipes seem to be warm/hot, and about evenly- so I'd say it works mighty good in that respect.
There's a pic attached... me and my (lack of) imigination copied Gerwin exactly, or pretty close to it, which I'm sorry for
I'm looking for improvements, though. 40c isn't bad, but I think maybe it could be better. Room temp's around 22, but system temp (where the is sealed in) is 28. No way to get water temp, but maybe I'll see if this neat probe thing I have can do something. So any ideas? Fins or something?