Looks like fun! Are you going to try to drive it over any unfrozen lakes?
Actually its not that hard to drive them on water, you just need to keep the throttle open

My 2nd ever snowmobiling trip was in late spring and the trail we were on was mainly ice with water after a while.. Sometimes like a couple 100 meters of seemingly open water

It was ice with about 30 cm of water on top tho, so it wasn't really dangerous. Still, you don't want to get stuck there because those things are heavier than you think.
But to answer your question, no I'm not planning on drive it on any open water, it's fun but not worth the risk. Temperatures are about -25C/-13F here atm so there won't be much open water left soon anyway, the river here is the only thing thats still partially open.