Well i checked it out and so far so good. They are high enough to be placed on decent water deeps.
Do you want to create 13-angular one or should this one a try for an "round" footer?
I think it would be a nice idea to create some "universal" footers they fits the same like the B&M ones.
After a look at yours you've done this with 6 angles and with 4-rotations we should coverd all support positions they could be placed.
An idea from my side, maybe some special-formed footers were nice, so why not createing "octagon" and "hexagon" formed footers? Triangular ones are to unrealistic so they are out in my opinion
Maybe some smaller square footers for smaller coasters, style like the B&M ones but i dont know half sized were an other option.
Keep going, looking forward to this
Lg Cheleste