hehe that's pretty neat you are obviously a skilled fabricator and have quite a unique imagination.....not exactly what I would build but pretty cool nonetheless lol!
2 statements I'm having a hard time wrapping my head around though. "It is easy to sidehill"?? and "it weighs 550lbs wet" Is that really true?
I'm guessing the reason you went with 2 10" wide cut down tracks instead of a single 20" wide track was to get taller paddles?
I would bet yes its weighs that much. Tundra's are barely there to begin with, looks like this is motor and track mainly. They aren't built as stout as some other sleds for sure, which is where you could save some weight. Look at the front end in the pics, there is only a shock, steering arm and lower a-arm on these sleds. There is almost no seat on this sled as well. The bulkheads are light too. Again, not something that you would want to ditchbang on or drop a big cornice with, but for plugging around the hills and floating along, it would be perfect.
Great innovation! Props to the creator!