My view, not having seen him, is that he is essentially a powered glider, with the ability to prolong his descent, but always descending except when using stored energy to swap speed for height.
That being the case, to get him off the ground would require much more powerful engines, which add weight, which means more structure…
Keep on down that road and you end up designing the Bede again.
Moggy
so i guess this is where more powerful engines come into play. ive seen this done before, where some guy designed this tiny aircraft powered by a pair of RC jets. so more weight shouldnt be a problem as long as there is still enough lift and thrust. considering that the pilot is prone, drag should be considerably less due to a lower frontal area. as for lift – BWB?