I did ask Vans and they suggested that I make enquires on VansAirforce. I did find some very basic instructions, but nothing on the integrated wing fuel tanks, in the heap of papers that I inherited with the project.
PS: Love your RV3 Tsamsiyu and the build pictures posted have already have been very extremely useful.
At the moment. I'm considering purchasing the 3B wings for a variety of reasons mainly concerned with, confidence on doing light aero, re-sale value, the amount of information of building and support etc.