If you're going to put so many points in CON you can go PSI and still have a lot of HPs. You'll also gain:
Stoicism - stack nicely with other damage reduction sources, including Lifting Belt;
Fast Metabolism - more healing;
Force Field - 25 Psychokinesis (you don't need more to make good use of it); a barrier that can shield you from ranged attacks and make your enemies close distance so you don't have to; good for slow melee;
Other PSI abilities that can help with survivability are Disruptive Field, Cryo-Shield and Pseudo-spatial Projection. Not to mention crowd control.
You can also support your hammer strikes with Psychostatic Electricity. You'll need 30 Psychokinesis for Electrokinesis.
I'm not posting exact build because i'm lazy i believe building character yourself is very fun.
After some thinking, I decided to be inspired by hilf, and go with psionics as second power.
Specifically metathermics and freeze abilities, supported by basic psychokinesis.
It is unfortunate that we must give up ~25% of our HPs to do so, but it is a lot more fun to use various psi instead of only sledge, and we gain much needed range, for a slow tank. Also, Stoicism kind of makes up for lost HPs.
Stats:STR 10
DEX 3
AGI 3
CON 10->14
PER 3
WIL 7
INT 4->6
Skills:Melee
Hacking
Lockpicking
Mechanics
Electronics
Biology (some)
Tailoring
Psychokinesis (30, for forcefield/electrokinesis)
Metathermics
Feats:1- Opportunist
1- Stoicism
2- Conditioning
4- Thick Skull
6- Juggernaut
8- Cryogenic Induction
10- Premeditation
12- Armor Sloping
14- Super Slam
...
Basic idea is to be a walking freezing tank, crushing everything to bits that is close enough, using mainly cryokinesis for long range.
Cryostasis+Cryogenic Induction=Shatter
Super Slam+Huge hit pool (Sturdy vest heavy armor, juggernaut, high con)=shatter everything to tiny ice cubes.
Currently in depot A, and it is very fun so far
Criticism of build is welcome.