so almost got stuck on a youtube loop... anyway, there are plenty of vids of make a wind tunnel... homemade that is. Angles, positioning, etc are what is going to take the most time to get right. Everything else is not that hard... But what do I know. I'm not a wingologist so I don't know anything about wings
But I did read up on the vortex generators. Waaaay too confusing for me. don't have time right now to look into it. very intresting though... It said aything past 40 mph experiences wind turbulence... so the roof wings cause this and the wing offsets it or increases drag/lift... I think I confused myself.