These are the custom maps you will need please make sure you have them :

SupplyDepot2
tc_Base
et_ice
et_beach

Rules to note on 3v3 Clanbase :

No mines
No Riflenade
No Soldier of any weapon.

Maps are played with the following timelimits:

Radar (timelimit: 10 mins)
SupplyDepot2 (timelimit: 15 mins)
tc_base (timelimit: 10 mins)
et_ice (timelimit: 10 mins)
et_beach (timelimit: 10 mins)
Goldrush (timelimit: 20 mins)
Battery (timelimit 10 mins)


Also its worth noting that the clanbase config is strict!

I will not let you have a very tweaked config it trys to make it fair.

So try familarise yourself with the new customs that you dont no.