TSG3 was definitely one of the inspirations for the map! as for the cornucopia, I know exactly what you mean. Its the pit of a drill so it's steep, which was definitely a problem. I fixed as best I could with platforms and ladders/caves, but it'sstill going to be a little hard to get out of. Not much else I can do for it though.
Part of the Command HQ is indeed floating, and being held up by "gravitation devices" that I came up with and built under that part. Maybe I went a little overboard with the imagination. Sorry for the confusion, and thanks for honest the critique!