Looking through the points (and not really understanding them) I decided to replace everything between the offsets with random hex. The result was the coll model being all screwed up. So just a stab in the dark but i think that between those offsets is the coll model. If we could move those points in relation to the blood gulch model points, then i think a custom map maybe possible.
I say post your ideas, because I (like many) would like to see a custom map