RE: DeHavilland DHC-7
The only part I'm worried about is the Horizontal stab. If you look at the plans pic the stab is a flat bottom airfoil and is shown on the plan mounted inverted. I don't know if this is a mistake or not as some aircraft were built with inverted airfoils on the tails. Do you know if the full size one was like this?
While I was writing the previous reply, I remembered some drawings I copied from a tech manual the mechanics had where I worked. It was some views of the wing plan, Stab plan, and some details of the nacelles, and fuselage stations. It was mostly, the locations of the various "stations" used to locate various parts. The side view of the rudder shows the Stab center rib profile but not much detail. It appears that the Stab airfoil is semi-symectrical with the deepest side on the bottom, to produce lift in a downward direction.
Joe