Longest game?

[Yef]

A cultural center?
I have never managed to build one of those. It takes forever!

I only play single player, and the longest would be well below 300 turns. The thing is that I always come up with this new great idea for a new component or facility, and when I add it I break the game.
But its awesome. Now I have drone fighters, not just the real drones, and drone tanks, and Assault Infantry (2kt), power armor for infantry (engine coded so you can't use it on tanks) and a gazillion more little twiks.

My next game breaker addition will be more power armors:
1-Power Armor (30% defense bonus, deflects 10 damage)

2-Combat Armor (40% defense, 10% offense (superior targeting equipment ) deflects 15)

3-Assault Armor (50% defense, 20% offense, deflects 20)

I was also thinking of "conventional tanks", something like a 5kt tank that doesn't need any tech, so you can build it from the very begining with a depleted uranium cannon and composite armor.

One thing I don't know if it will work or not its artillery units. I had the idea of making an mobile artillery unit that could have an indirect fire weapon that could reach to a range of 5, but I have my doubts wehther it will work or not.

Would a long range ground weapon fire over the heads of friendly units or does it have to wait until the units on the first row are destroyed to then engage the enemy in close proximity combat?