Curious Mazer, why only total of 4 transports? Since 2 are pretty much permanently away on pirate business, that means you have 4 spots that you can open up from Japan by purchasing 2 tp. That seems a better deal than buying a complex, which would only open up 3 spots. That’s why I assumed you get 6 tps, so you have 4 tps using up the 8 slots on Japan while the other 2 are raiding IPCs.
I think I’d be happy with 6 tps 2 complexes (78 IPCs infrastructure to open up 14 slots, meaning 10 inf 4 arm per round at 50 IPC income) instead of 4 complexes 4 tps (92 IPCs infrastructure open up 16 slots; you could fill that with 15 inf 1 arm at 50 IPC income). In both cases I know 2 of the tps are off raiding, but it seems like too much infrastructure with the 4 complexes and also you’re opening up slots you can’t even fill with offensive gear anymore.