First of all, I really liked the concept. Maybe you went too far into the replica side of nothings instead of going for a remake but still very cool.

· Corners = I like how generic they are. Whether you're going for a replica or a remake, the tracks in Stunts are made of generic pieces (that's why the game had a track editor).

· Ramps = It's cool they are all generic but you gotta add some sort of transition. The original game didn't have the transition to avoid using too many polygons and that's why the cars didn't feel them but you should probably have no problem making the transitions somewhat rounded. It might break the looks a bit

· Other obstacles = They work how they should, you did a nice job.

· Surfaces = You gotta make what everything is a bit clearer. The snow is confusing for many people (watch a bunch of Youtube videos) so maybe adding some texture might help.

· Extra comment = You mentioned how high ramps are. When creating ramps, it's usually not about the size of the ramp but the angle of the take-off. Maybe, for the future, you could experiment with different slopes and different heights.

I cannot help you build tracks myself (I'm not a PC-wise guy) but, if you want, I can help you testing stuff or just talking about track design.