Hi Fred/Ronan
Complete and install the wings first, as they will act as a guage for the V-tail alinement.
As for the V-tail support, the bottom of the block sits on the bottom of the inside of the fuselage at the tail, any ply sticking up from the v-tail support slot, can be removed when the block is glued in place.
To get the correct v-tail alinement, place a strip of wood across the top of the two fins, and move the ply wire block, forward/back or side to side, to get this strip of wood level or horizontal with the wings looking down the nose of the fuselage see pic:
Fred can you translate for Ronan!
