I noticed something that seems a bit odd. There is a few degrees of incidence on the bottom wing but the top wing is at zero degrees. I measured this in the plan. It looks the same on the bottom wing when installed. I thought the wings should both match. Could it be an advantage to have the wings at different angles so one wing stalls at a different angle than the other? One thing is for sure, we'll find out when it is in the air!
Biplanes often have the upper wing set with a lower angle of incidence because the downwash from the upper wing artificially decreases the angle of attack of the lower wing. The effect is minimal from what I've read. Some biplanes will be rigged the other way, so that the upper wing stalls first, keeping the lower wing flying aiding in control through stall recovery. The effects of these factors are affected by many variables and in practice setting both wings to the same incidence is satisfactory for most aircraft.