Making a map/game mode

Hello everyone. I’m currently in the process of making a map that will be like a 3-way battle between the unsc, covenant, and prometheans.(red, blue, and yellow/orange respectively) I’m working on the vehicle balance right now, and so far the unsc will have a scorpion, rocket hog, gungoose, and 1-2 wasps. The covenant will have 2 ghosts, a wraith, and 1-2 banshees. The prometheans will have 2-3 phaetons. If you guys could give me your opinion on the balance or general ideas for the map it would be much appreciated. Thank you.