Ar can is what you need.
Start with 8 str 9 con 9 per 5 int, other stat on 3, than get str to 9, con to 12 the rest go to per as well as a veteran feat. The skills you need, other than guns. is throwing, crafting skills and mercantile (You need good armor, ammo, and special goods in store). Max mech and electro is a must, some bio and early chemistry would help too. Must have feats are, full auto, commando, conditioning, fast metabolism, Thicc skull, concentrated and suppressive fire, oppotunist.
For the gear the tungsten armor will do the job. Make a good ti chrome armor near the endgame to deal with energy weapons, as a gun 7.62 and 8.6 Hornet will be fine.
You dont need armor slopping, since you dont have mobility, but with a good range and aoe bursts it is not a big problem. Just make the enemy come to you, do not try to chase them. The worst part of this build imho is how boringly effective it is when you get some decent armor weapon and some feats, and you also need to repair your gun reletivly frequent. On a brigt side, ar have a good dmg, so you didnt need w2c bullet as much as smg user. Also it is probably the only build that didn't benefit from psi that much, and you better keep your skill points and hp. Just keep an eye on a thought control enemies, and try to kill them before they make you suffer.