G,
Based on what is available on the web, the design feature that jumps out as a concern is the fact that they are demanding rather a lot of that little 2-stoke engine, operating at high power ratings for rather a lot of the time. Those engines were designed for target drones and UAV's and hence where never designed to last 'forever', shall we say. Therefore, my initial concern would be that of engine failure. This is a particular problem since there is clearly no crash protection and I see no reference to the amount of inertia designed into the rotorsystem - hmm!?. In addition I feel the tripod undercarriage provides increased scope for roll-over, though they do seem to offer a wide skid gear as an option.
One final point, have you looked through BCAR-VLH to ensure that it will get through, as without that it can't fly in the UK anyway.
I have to say that if it were a member of my family I would have to advise against it.
Safe Flying
CRAN
