I am working on uploading a large collection of plans I have accumulated over the years. Some in CAD format, some not. Electric, gliders, glow, rubber powered... all sorts of stuff.
for the cad ones, you need a program that opens dxf or dwg files. Autocad, turbocad and all sorts of stuff. Some free programs can be found to download.
This is the one I had blown up to 200%. It will have a 72 inch wingspan. I made one with a WOOD propeller in the early 70's as the original stick and tissue free flight model and it flew really well.