Biplane assembly is always a challenge and there are probably as many ways of doing it as there are modelers!

There are many approaches to keeping the incidence between the wings also.  Ian's suggestion is one I use alot.  If you haven't discovered foam board from the Dollar Store I highly recommend you make your first purchase right away.  Get yourself a good square for making 90* cuts and a good sharp xacto blade.  Trace the plan or copy it and glue the side view of the fuselage showing wing positions on the foam board.  An as Ian has said cut out a jig to fit between the lower and upper wing on each side of the fuselage at the same location (distance from fuselage) on each side, that allows you to align the upper wing in position both incidence and also in perspective to the fuselage and empennage. (L.E & T.E. at right angles or proper angle to the fuselage) 

I'm getting too wordy here but some cut a jig that keeps the whole model stationary on the table as well.  It's really up to you to figure what works for you.  Foamboard/foam posterboard is a great modeling tool for making all kinds of patterns, forms, jigs etc.

Here's how I approached the jig solution, using card stock, for my New Standard 25a biplane.  See picture in  the the build thread here:See reply #20 Click Here

Monz on her Fokker DVII used the foamboard to build the jig that works from the table up supporting the whole model: Click Here Reply #151
Tom

Hello all, I hope this is the right place to ask my question.
I am building a Guillows SE 5 and have reached the point where it's time to mount the top wing and I'm wondering if there are any tips or secrets.
Do I install all 8 struts (4 wing and 4 cabane) on the bottom wing/fuselage or  just the wing struts then try to work the ones on the fuselage in?
Any and all help would be greatly appreciated.
Thanks ken