Man it woyld really help peo0le out uf you added to every spot if ita buildable on official or if its just unofficial, its ass to go on and check every single one yourself
I use #3 all the time. once you set it up properly it can't be raided because people can't get inside. the upper area can be mesh bitten however. there is also a 2nd entrance above the crystal. the best method to get inside is to place a ladder, you won't be able to leave so use fjordhawks and beds to teleport in and out. break the ladder and place a few turrets and you will have a great base. you can place reps, Indy's and pretty much everything you need if your good at building
that first gen 2 spot you can infact get a rafe through, I built in there, you need alot of annoying spam at that little entrace clip spot, I blocked it with motor bots as well and set turret far far back, you can tho fit 2 indy forge throw out 2 to 3 giga, in that spot, so its pretty decent for a 1-5 man started then bounce once you get some rescourses.