Using math to make a base (HUMANS)

Ok everybody knows that mostly all maps have 100 Bp (building points if you didn't still know) so how to make them be enough??? well first RC (reactor) doesn't use any Bp and is the source of 'em and as usually for good gameplay you need attleast 2 nodes (telenodes) so it uses 20 bp of your 100 O.O don't worry it sounds a lot but its jus 1/5 of 'em. You also need medi (medistation) and arm (armory) and they use 18 of you precious Bp so for quick count 18+20 is 38Bp!!! you have left 62Bp. well these Bps you should youse for the rets (turrets) well if we make nice count we will get that we have Bps for 7 ret6s and if you are at S2 (stage 2) we should minus also the DC (defence computer) but it needs only 8 bp so it's only 1 ret less but YOU HAVE ONLY 6-7 RETS SO THINK TWICE BEFORE PLACING!!! whit remembering the needs of Bp/structure you will make a good base and defence whit a little count. But make a node or two in start and then start making a defence (make 1 node and then bounch of rets) and when you are making something remember to make after couple og rets that the humans need arm for killing aliens the normal rifle is just insect for EVEN dretch so they need the arm more than anything and when you have back up you need to make more rets but don't worry if you have still bps (normaly 6) after making by my counting don't worry if you just got 10 bps more (some maps have 110 bp) you can make 2 rets more but hey it's a thing you must stand you can't do anything for it. I wish you were helped by my guide.