So what I was thinking is that there are multiple teams.
Every team has 10 - 15 minutes (depending on the round) to build a ship within a certain pricerange.
After the building is done, every ship from every team built gets spawned in an arena where they fight until one ship is left
Like this are 5 rounds. In my opinion the rounds should go like this:
Round 1 : 10 minutes build time : max. 85000 cost
Round 2 : 20 minutes build time : max 140000 cost
Round 3 : 30 minutes build time : max 350000 cost
Round 4 : 40 minutes build time : max 500000 cost
Round 5: 40 minutes build time : max 1000000 cost
Ships made before this match cannot be used!
Maybe even make the stats per round configurable.