After some earlier iterations, this is what I'll be using in my current .17 game. Features:
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Single header train with an artillery wagon and cargo
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Artillery wagon shells are unloaded and feed two artillery turrets for higher rate of fire and sustained fire after train is gone
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Defense is gun and flamethrower turrets
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Cargo includes ammo, repair packs, conbots, and walls & turrets to replace if needed
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Circuit features: Bots added if low, train stop disabled if stocks are good
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Train leaves when any cargo is zero OR train stop is disabled and time passed
I've only tested in creative, but seems to hold up against 100% evo enemies. I'll now use it in my actual base. Not sure the walls are needed, but I think they look good :).