This can get transferent in Blockwars as a gamemode :)
1: Kits of BW are nice for your idea
2: Already existing BW maps need 2 more sides and probably a bit of a Mid-Make-Over (small) (<-easy to do)
3: Safe Spots can be the Flag/Core spaces on BW Maps.
4: Can become cool if this also has a "Build Preparation"
I like it :)