Just saying that I build solid blue foam planes. No lightening holes anywhere. 1 piece of thin plywood for a landing gear spar. 400 brush motors & VPX cells or A123's.

Build her any way you like with almost any airfoil . I light the flat bottom Clarke Y. It stretches a glide & is easy to build with the flat bottom.

It will always be less than 1 pound / sq. ft.

Low speed is more like landing a kite in a gentile breeze. These Deltas float forever at loww speed.

When you do your first landing approach you should feel like. Will it ever land ?