Be careful ThePurple! Pseudo 3D graphics are generally solvable with a lot of hard work but 3d gameplays are totally another thing.
JJXB already had a bloody lesson with River Ransom City here ^-^
Character moves in 3 dimension but all we have at most is y position of main character. Without y position info we can not transfer other characters to 3d space!!!
Back to Excitebike, that's obviously 3d gameplay because the bikes can fly in the air but with current ram map info, all we have is:
0x03D4 : coord y some kind of vert pos, not quite though
That's even worse than River Ransom City here :(