This is what (4) Half Pipe SHOULD be. Dang - owned. Anyhow, I got the idea from Halfpipe/Mcnewgins comment on Half pipe. I had been thinking about doing something like this for awhile, just never got off my ass.
One main strip of lower ground that you need to go in to get to another base.. easy as that. Enough outposts I figure, I made them all with some having distinct advantages, and other with big dis-advantages, some with both :).