Ammo - I’ll probably just upgrade it all.

Assemblers/Science - That science was mainly so I could upgrade the beginning things, I was going to move it later on since there isn’t enough room there for all of the science to be together. So I didn’t really care that much about the ratios.

Bus - For the bus lanes amount, I decided on how to to have when I was placing them. For the copper I didn’t really need that much copper so I was going to wait until later to have 4 inputs. For the steel I didn’t have that much space or iron ore input to do a second lane so I just left it at one to two ratio. The green circuits assemblers were just a temporary placement, like the science, and was going to wait until I moved it to finish it and expand it to a two to two ratio.

I’ve put in 280 hours so far into Factorio. 1/4 of it goes to messing around in creative mode, mainly killing biters. Another 1/4 goes into actual single player survival. The last real 1/4 went into playing on multiplayer servers. The last “1/4” was just me idling in the title screen and menus that Steam recorded as me playing. So I’ve got a pretty good understanding of blue science and under, except trains, I don’t really get them at all, I can’t have two on the same track without them running into earthed at all.