help needed to build a team

I open 40 cells n each 10 pact gave me horde tinkerer v2, mecha horde, rouge ultra mech, fat head.
I felt extremly luc ky today in weeks. I have 2 npe ultra mutant v2, a npe giga primarch n currently working on a npe samurai. So experienced players what should i built next from the above bounty? Help please

Normally selling a v2 cell familiar is better than keeping it as the stat difference is noticeable. Try slinging them into either resources or r1 familiars to build a fam that will be worthwhile in the long term.

edit:
That being said, park your npe ultras on top of that giga primarch and throw whatever you can on the sides...when AO procs your ultras turn into team killers.

Thank u.
And about rouge ultra mech, is he a worthy squadmate to go with the rest as i dont have big rug?