[@thewizardguy]

funny you should mention a sledghammer as that's oddly enough his weakness. you kinda got his defenses mixed up. he's obscenely potent at combatting energy weaponry (lasers, plasma, things like that) as it's like throwing donuts at the average american's mouth and hoping it doesn't eat them while kinetic energy can have a dampening effect applied to it which make bullets useless below certain calibers, if you actually manage to walk up and start punching him, there's not really much he can do aside from try to flee and shoot you with lasers at close range which is NOT a good idea as, at that range it's rather simple to just move his arm or whatever he's firing with away from you while the charge is building.

in terms of energy input, he has no effective cap yet, however, his core is currently pristine, a couple fights and that might change however, in terms of output he does have a charge time where he has to drag the energy out, build it up, aim it, and fire.

in terms of tankiness, himself and his constructs are actually surprisingly physically weak, most of their ability to defend themselves comes from killing the thing trying to kill it first or shielding... if i had to describe his tankiness, think of him like an archon from starcraft; LOTS of shields, 10 hp

ergo, pretty much anything he made would be inherently weaker than if he'd just built it with concrete or something, but it would be alot more efficient energy wise and he wouldn't have to actually mess with things like concrete.