Hi Mark,
the second .txt file is is the .pdf converted to an Autocad .dxf file so you can modify the drawing. The first .txt file is an Autocad .dwg file that contains the same drawing but also the drawings of the parts to make the wings and elevators.

With regard to the wing and elevator drawings I made some pretty large assumptions in that the airfoils at the tips were the same as the root, this may or may not be the case in real life. I also assumed that the wings and stabs are straight without any weird twists built in. Interestingly enough I have one plane where the fin was straight but I had built the rudder with a twist (by accident) the plane didn't seem to mind, however years later I ended up rebuilding a straight rudder for it and it now needs a rudder to elevator mix for inside and outside loops. This is something I would like to explore more.

I'll convert my Aries 07 to Cad one day and use that as a reference for future projects...