While I have no desire to take off using black powder rockets, I do think the Lippisch Ente canard glider converted to rocket power is worth a look as an inspiration. With a nod to Mike Sandlin's Bloop series (below), I have often sketched simple, single-seat microlight aircraft (not trying to make Part 103 weights, just a gross weight under 300 kg/661 lb) powered by off-the-shelf modern paramotor engines. That implies a pusher design to make the engine installation literally a bolt-on affair. It's not hard to imagine a simple canard pusher with the lines of the Ente but in aluminum tube and fabric like Sandlin's designs or the old Superfloater ultralight glider (above), easily adapted to whichever 25+ hp paramotor engine you choose. An adjustable seat and pedals, perhaps even an adjustable control stick, would make it easy to adapt to almost any pilot weight and height.