I motorized a 1/24 mustang, heat did cause a prob. On the contest table, after about 5 mins. of running, the whole prop flew off and bounced across 3 tables. Luckely, it did not touch anything else and no-one was killed. The NTSB investigation revealed a melted mounting hole.
I tried again with a 1/24 spitfire, but this time made it so that you have to hold the button down, no probs.
I think that kit would be a prob. to motorize. The rotor is right over the cabin. I think you would have to put your motor behind the wall and work out a belt system for the main, good luck with tail, and.......is it really worth it? If you do it, I'm sure everybody here would love to see it, I know I would. good luck!!!