How much space does SB3 take up?

I was going to get SB3 (Space Build 3) because I just got LS2 and RD2.
I have a few questions:
How much space does it take up.
Does it need any extra packs for it.
Know any good server IPs with regular players?
Edit: Title fail.
Meant it to be how much space it takes up.

I find spacebuild3 laggier.