It can be tricky on a large model like your 1/3 scale Pup since the wing panels are really just hanging off the fuse and center section (as on the original). So the wires not only control incidence and dihedral, they actually hold the plane together! If a wire (or a couple of wires) comes off on a large Pup, there's a very good chance of one (or more) wings coming off also.

Scroll about 2/3 down this page from Mick Reeve's website showing how he does the field setup for his Pup. As you can see he "hangs" the wing panels first with the landing wires and then slips in the struts as a fixed unit. Obviously, this method depends of getting the length of the landing wires perfect to start with.

http://www.mickreevesmodels.co.uk/~m...es/p2bipe.html