Thanks Juan and Stephen, there's a long way to go yet though.....
I spent 5 hours today looking through pics, measuring, and marking out the strut locations. I started with the upper wings, laying them on the plans and marking them, then I transferred those measurements to the lower wings. The locations didn't match the walkway positions I'd already added which meant either I would have struts that weren't vertical, or the wing walkways wouldn't be in the right place relative to the struts! After a lot more comparing and thinking, I realised that the fuselage for the sharp-nosed Veh is narrower that that of the blunt-nosed version, which is what the plans are for. Since I had marked up the lower wing walkways from these same plans it meant that they were slightly off. I decided the easiest way out was to mark the lower wing strut positions in the right place by lining up the correct positions with the upper wing, and add 0.5mm strips of plastic card to the inner edge of each lower wing to push it out a little and straighten the struts.

A lot of time and thought but well worth the effort, wonky struts just won't work!
Ian