Thanks Lance, Antonio, and Stephen, for your comments.
Unfortunately the jig didn't work out too well. This is proving to be by far the trickiest wing-mounting operation I've done to date. The single struts make fitting them easier, but then it lacks fore-aft structural strength. I've made a couple of failed attempts (I did take pics but my camera has eaten them!) but I think I'm on the home straight now. The biggest problem has been keeping the centre struts in place - of course this would have been resolved if I'd simply followed my usual procedure of pinning them, but for some reason I didn't!
I tried fitting all the struts first, with the intention of sliding the centre wing over them when dry. Then I realised that it wouldn't be possible to add the centre wing with the jig in the way. (doh!)
Then I tried with the jig in place but it wasn't working out and I would have had to tape the wings to the jig, defeating the object of having it adjustable.
I tried adjusting the Aeroclub jig to use it for the centre wing, but that wouldn't work as the bottom of the wing rail hit the little clamps that hold the wings in place before I could get the gap narrow enough.
Finally I added the centre wing with the struts through it loosely. That was very awkward as the struts kept slipping out as I was trying to fit them, but I eventually got them all on and left it overnight to dry.
This morning I added the upper wing and clamped it in place. that is now sitting to dry. The centre wing is still not fixed in place. I'll adjust it and fix it permanently once the top wing has set. Hopefully the struts will stay in place during that operation!
So here's where it is at the moment...
This one is proving more of a challenge than I'd expected, I should have put a little more thought into pinning the struts and maybe even worked out a way of attaching the struts to the centre wing before fitting it all as a unit, but that would have been very tricky to get the strut angles, and therefore the wing stagger, correct. Of course, I could have just left the mounting lugs on the struts, or reduced them so they were less noticeable. Maybe even marked the struts with the position and angle of the mounting lugs before removing them....
Anyway, hopefully it's on the home stretch now!
Thanks for looking in!
Ian