Rich, yes I have seen that happen on the MiniMag, it seems the canopy clips are the weak point of the design. A couple of magnets holding it in place should also do fine

In the meantime... it's finished! I just need to put a receiver on it and go fly. CoG isn't much off, but still, pushing the fuel tank further inside the fuse, closer to the CoG and stuffing the receiver battery way back should be enough to balance it.