A guy on another form has what he claims is a Preunit A7-A10 frame that has been hardtailed, (Cant tell if its actually unit or preunit) Plus a OIF A65 frame, a Tank that he thinks is Mid 1950s and some other parts,
I have NO Involvement with the seller, but if you are so inclined, the frame is only $150 for the preunit frame.
He is in the US, so shipping could be an issues.
FYI
See:
http://www.chopcult.com/whittiger650/classifieds/" I believe this is from a mid to late '50's model. Has tabs welded on and bondo at the front of the tunnel from the good ol' chopper days. $125 OBO plus shipping from 05641 in Vermont."
" This is an A7/A10 frame with a weld-on hardtail. One of my many projects that I have decided to let go in order to fund my 1974 Triumph Trident purchase. This frame needs some work. I started the process of removing the massive amount of filler. No numbers that I can see but who knows. Cut the hardtail off and use it to put another Pre-Unit on the road or build a really cool chopper 1960's 1970's style. $150 plus shipping from 05641 in Vermont."
YRMV