...it sounds so simple, right?
Well, it isn't. First of all I've spent way too long just getting the ground mesh in and working - importing the curves from Illustrator looked awesomely easy but resulted in insanely messy meshes. Once I got the meshes looking kind of alright the scale from Maya to Unity was all messed up AND THEN I realised that the level design wasn't built for screen proportions in the first place so I had to go back to Illustrator to stretch out the level paths and start all over again.
Anyway. I got there in the end.