Ah, the "self-tacking jib" approach.
Downside is that each sail will "jibe" once per revolution - make a sudden swing from one side to the other with the wind behind it, building up considerable momentum before snapping the "sheet" (the line limiting its travel and transferring much of the thrust to the supporting structure) tight. This energy is dumped into the line and support fittings themselves and dissipated there.
On a boat, and accidental (uncontrolled) jibe in a high wind can break the fittings, boom, or mast, tear the sail, rip the mast out of the pulpit, possibly even damage the hull enough to sink right there as the mast is torn free. A controlled jibe requires taking up the sheet against the force of the wind, which uses energy.
On this thing the lines and frame should be strong enough that things shouldn't come apart right away (except in a very high wind). But I expect the constant snapping-tight will quickly wear out the sheets, and also the sailcloth, especially near the grommets. Probably broken sheets first, torn sails after a couple sheet replacements.
Also: It will be LOUD. WHAP! WHAP! WHAP! ...
A boom brake might help: That's something like a cylinder on the boom with a couple turns of rope around it, with the other ends tied to the frame a bit beyond the ends of the boom's travel. The faster the boom moves, the more the line tightens, and the higher the friction, regulating the speed of the boom's motion.
But a lot of your energy will go into friction on the boom brake - again wearing out the components, and NOT helping turn the genny. IMHO if you're going to do something like this you need to figure out how to get that energy into generation rather than component wear.