G'day mate,
Working with a jig from the inside of the hull might make it easier to tack up but would be difficult to remove from the hull panels because you would be pulling it against the structure of the ply and would tend to jam, I think.
Mick, that is one ugly jig
why, thank you
Yeah, it was ugly but sometimes ya gotta do what ya gotta do.

As it was, the main hulls aligned perfectly but the tumblehome panel was a little askew. I didn't notice it till it was too late.
Mate, I posted the link and the pics because I have been pondering the same problem with my next build. I think Matts jig will do a great job Of aligning the panels but I just dont know how to tack the stems with it in place. The only thing I can think of is to tack as I suggested, then use something like my stick rig to hold the stems together while the jig is removed. Perhaps the tacked up panels will hold themselves in place. I just don't know but plan on finding out soon.
Something like a Wadefish was a very ambitious build for me, and I found out very quickly that I didn't know as much about this caper as I thought I did. I think you are doing an outstanding job and I wouldn't rush the build just to get the stems done in a hurry. If it takes three or more steps to get it done right then I would recommend you take as many steps as you need.
Oh yeah, Not sure which fish it is you are talking about. Can you post a link?