For those who haven't heard of, SimplePlanes is a simple plane-building game with a selection of plane parts and weapons. Construct you own plane, put it up on their official site, and download other's planes.
Their fuselage parts and are procedural, with selections for their size, corner type, and slope. You can modify the amount of fuel it has, the mass, and the buoyancy.
The wings also are, and they can be extended to insane sizes. The dihedral can be edited as well. It can also carry fuel.
There are 3 prop engines, 5 jets, and 1 VTOL core.
I can request a mod that does this, better if it were a stock addition.