i think your way over thinkun this glue up mark..vaughns sled trick is good for alot of things but you shouldnt need to do this.. you can be that far out in your glue up i know your a chemist so that tells me your used to be real close on anything you do.. so you should be fine at just a little plane work and some craping and then sand it ready to go.. KISS.. vaughns sled as its place but you shouldnt need it here.
If in Doubt, Build it Stout!
One hand washes the other!
Don't put off today till tomorrow!