Now Big A is off topic… - but thanks for confirming this possible snag, Andrew. That's what I wanted to warn Jimbobh about - would be a shame to sink so much time and effort only to end up in a cul-de-sac.
To illustrate Andrew's vertex-point for those who may need a tad more infos (and to display how smart I think I am), consider this:
A 1029x1029 Unity terrain (rather low resolution with about 1 vertex point per yard at most), has 1.05 mio verts. Double the resolution to 2049x2049 (1 vertex point every 1.5 feet, for small courses), and your count goes up exponentially to 4.2 mio verts.
So either way, 80K verts would be about the vert count of a couple big trees in Unity.
(And Andrew: the only way that I want the CourseForge side of things to move along nicely is not in a verbal, unspecified manner, but from your server to my hard drive.)
And yup, Axe, my bad, t'was you who said sorry first.