WOAH! VERY NICE!
I agree, you should look into DK tracks. You also should take a look into Ninja Gaiden tracks as well seeing how you have the right feel for making some absolutly epic tracks!
Ide love to see what you can do with a classic! Ive been pushing people for a very old N64 game's tracks to be revised. So heres a challenge for you and I hope you accept!
Quest 64 - Brannoch Nights (Town of Brannoch) If you need the origonal to work with, i can give it to you . Just msg me and ill give you a direct link to where you can get it :D