I replaced my canopy screws and T nuts with nylon nuts and bolts with a 10-24 thread. I epoxied the nuts in, and cut clearance in the holes in the fuse to allow them to fit thru. I burred a flat spot on each screw to add drag to the bolts and everything stays put. The nice thing is they are knurled, so you need no wrench.

As for the cowl, I basically only used the top half of it. It comes off without removing the prop, and the whole engine is exposed underneath. Still looks much better than no cowl.

If you are running an OS 61, it will be more nose heavy than mine, but will have more than enough extra power. My engine weighs just a couple ounces more than a 46. You might be able to swing a 13-6 with that engine.