Thanks again all. Owing to me being a bit previous with the making tape application, I've reversed progress a little. I taped up but hadn't fitted the IVA trim around the holes, came to offer up a wishbone and realised it would be impossible, or at least very difficult, to fit later. Cue removal of lots of tape very carefully (nice tip @nickh7, ta). Then a lot of swearing while I got the trim in place when what I really wanted to be doing was assembling my front uprights. I'm now back to the point I was before but with trim in place and a lot less masking tape applied this time around. Cheers @pugwash for the nylon bolt approach. I like the idea, although the attachment of the rear wings seems a long way away at the moment! I'll make a note though, for when I do get there in March 2020.