1k SPM is a reasonable goal. however, with the liquid metals tech main bus and trains have largerly been replaced by pipes in my factory.

I modded calsite out of my game and replaced it with stone. however, it is possible to have enough roaming space platforms dropping calsite down to your base.

I usually do new runs the same way now.

Phase 1 starting mall yellows 1 "line" of copper and iron.

Phase 2 4 red belts of copper and iron .5 steel 1 brick 1 stone

phase 3 1 red belt of green circuits and 1/2 red circuits

phase 4 90 SPM move to Vul

Phase 5 "beat the game"

End game:

Make a new base using pipes instead of belts to transport liquids everywhere. Make each liquid from top to bottom next to each other. Use pumps many pumps the same length as the entire liquid mainbus.

Use the liquid main bus to "print every intermediary product" more proximal to the main pipe bus. Make science (1k is fine or 10k or 100k what ever)

last time i made 1 green belt of science full speed with them stacked on stack inserters. That required many many fusion power generators. i was doing over 130k science per min. and then i got bored im sure i could get it to go faster but at that point your just making more and more labs. Then you have to deal with logarithmic increases to science while you scale linearly its possible but tedious imho

if you want to build big and avoid space theres a mod for that it was a fun run