overwhelming
If you look in the files section of broodwarmaps.net under "utility" or "others" (dont remember which one) I added a small custom doodad brushpack for everyone to implement on their maps. They include these ramps + my highground bridge.
As for the posting, you gotta post everywhere cause not too many users use all the sites simultainiously. I actually believe i am 1 of few to use all of SEN, BWM, TL, PGT and GG.net frequently.
Ramps: The vision is very easy to locate in-game, to get a rough idea, the lines are drawn quite precisely the tile before the cliff-to-lowground begins if you know what i mean
They are quite large overall though so i have only encountered "problems" with this once, and that was when i built a turret for scouting, but missplaced it below on lowground so it saw nothing of the hill above
The nat open on 2 sides has been used before, most noticable on (martian cross) chow chow perhaps, although those expos on that map is a bit too easy to defend imo.
If you decide to give it a try, please upload replays on bwm.net since the system is really easy and requires no registration. It helps alot in balancing the map. Also drop a comment to push my threads if you like ;D
Thanks for your comments!
/Sp