Okay, this is probably less relevant as due to a computer Crass my new classes have been lost. (ARRRRRRRRGH!!!)

But does any one have any tips on how to balance units? Thank you.

Start the Game and Do Nolting. if you Loose, good. than Start with the other side. Do nothing. if you win after a few seconds, this side is overpowered. Find. Balance that the result will be for both sides very tight.

Or you give it to beta testers. If half say side A is overpowered, while the other half say side B is overpowered, than you found a good balance

I was thinking of making some maps. symmetrical, basicly just corridors, with CPS, would that be a good idea you think?

Maybe, maybe not. Have you seen the coruscant map lately released?? I thought this is a great idea, but it was an not so good result.
But i think a small corridor map with lots of cover can be very nice.

For testing I mean, to simulate places lik musifar and the upper areas in bespin?

I always thought Bf1 was balanced. Not sure if your aware but most bf1 files work in bf2. Balancing can take forever sometimes, espcially if your making new weapon odf files. Beta testers can help a lot with critism and testing reports

Well one thing is, it's based on lore, so some things cant be changed, the A295 is more powerful than the e-11, and the DC-15 carries 100 shots perclip, while the E-5 carries jsut 50. So this will be the callange in balancing/

You can give one side more reinforcements or more units on the field. For example the CIS has mostly double reinforcements and units on the field than the RCs. But the RCs are supported by the local clones, have more health and are more powerfull.
So here is a list how i affected the balance. It is different for each map. So you can not take the balance from geonosis for tantive.

powerfull weapons,
more health,
shields,
faster/slower running units,
more/less reinforcements,
more/less units on the field,
local sides with TDM goal,
local sides with conquest goal,
more powerfull local sides,