Andy, I have the second edition of Marc-Andre Chimonas' Lugged Bicycle Frame Construction, A Manual for the First Time Builder, and it is a significant improvement over the first edition which I had previously bought. I see the third edition is out now and Amazon is selling it for $13.40. He describes construction of an inexpensive single use "jig" for tack brazing the main triangle and a rather primitive method of aligning and tack brazing the rear triangle, but I think it's probably worth the price just to get a feel for the steps involved.

I'm actually tempted to get a copy of the third edition to see what improvements he's made.

EDIT- Amazon links don't work. Search amazon.com for the titles.

Lugged Bicycle Frame Construction: Third Edition

He has written a separate book on building forks which I haven't read, but there are four decent reviews (1 five stars, 2 four stars, and 1 three stars).

Construction of Lugged Bicycle Forks