Any suggestions for attaching the mainsheet track to the rear beam. It was bolted along the entire length with the nuts inside the beam.

This seems like a potentially annoying way to do it. Only reasonable way I can think of doing it is to get a long bit of timber, drill holes in timber with track holes as guide, hot-glue-gun the nuts and washers to the timber at the drill holes then insert timber into the beam at the right position and start turning the bolts until they all grab tightly then remove timber. If they don't tighten enough, gaffer-tape a wrench to the end of the timber and try to line it up with the nut on the inside and tighten the bolt.

Am I on the right track? (excuse the pun...)

Nick.