Ogriv,
The Monokote method would be a great way of sealing the gaps. You can match the color of the surrounding surfaces and would be practically invisible. Even if the Monokote were to fail in flight, nothing bad would happen, since it's not holding anything together. Now lose some hinges in flight, and that's a whole different enchilada!
My only concern with using the clear duct tape is how fuel proof is the tape or the adhesive on the tape? Monokote would be totally fuel proof assuming you cleaned the surfaces very well with alcohol before applying it. Now would be a good time to get a good heat sealing iron to apply Monokote with. Sooner or later you'll have to make some repair to the covering, and maybe even build and cover a plane later. That trainer would be a good way of learning to fly and getting used to the covering process.

Jesse