now that you have more detailed info to what is incorrect on the chassis.....
You say the back end is out, is that just the 2mm extra length between BR10 to BR12 ?
Are the angles of the the seat back frame ( SB1 etc ) correct?
If so then you might be able to "save " the chassis by removing everything forward of BR10, maybe even re using some of the cut out tubing, & maybe having a new front frame, now that you have the build table all marked out you can then correct everything to book spec.
cheers
andy
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