I have always wanted to build one. The problem I have come across is the cool looking fiberglass or composite "bags". I do have a lot of the rest of the bike built.
have you considered buying a small set off a 60s honda? sometimes Craigslist has the least expected stuff. You might get lucky.
On another note, Ever consider Plaster over chickenwire as a base? you form the wire, wrap it in plaster strips, wet it..let it set, shave it down for consistency and put a coat of sealer over it? Im just tossing ideas, Im sure the folks here know a much neater, cleaner process.
But its a thought. The way it sounds, you kind of want it to have that newer saddlebag look with the formed cases. Many of the folks I've seen building here have used things from Ammo cans to actual Harley Saddle bags. [ which actually looked AWESOME]
consider more open-minded options that could "LOOK" like what youre after with just a little ingenuity. Just a thought ^.6
-Jordan