This map looks pretty sweet
. The builds look very good overall, and I love the idea of houses stretching from the overworld down into dark caves. I also love the large radius and emphasis on hunting instead of nonstop pvp action.
My one comment from the screenshots would be to maybe add some custom cactuses like the ones on TSG2. Some of the overworld areas do look a bit bare (behind the house in the third screenshot for example), so adding some small things like cactuses would do a lot to diversify the terrain a bit.
I think you meant tier 1's. If not, then