Very interesting idea and solution. In my opinion, a guarantee of protection of 51% can be the main component that will attract investors' interest in project SnowGem.
As far as I know, in project SnowGem, attack 51 is impossible. Here, both classic mining and masternodes are used.
The update has not been applied to main net now. So theoretically 51% attack is possible atm. But this will change very soon.