Thanks for the suggestions, all! Keep 'em coming!
Various issues in no particular order:
1) Where is the gauntlet listed in the game? Is it only in Martial Power (or DDI, or whatever) or am I missing it somewhere? Or will I have to reflavor the Club?
2) I'm a bit disappointed that 90% of the Monk powers are Dex based...and I'm known for Dex based 3.X Monk builds! Given the prevalence of Str Monk builds in the previous edition, you'd think that they'd throw that option a bone, especially considering the "Stone Fist" Monk fluff and RW power-based martial arts techniques. Perhaps I can get the DM to let me reskin some Monk powers as Str based.
3) I don't think Box as a solo/primary Infernal Warlock fits the Hellboy side of the Hellboy/Hellraiser theme. Hellboy is a pugilist who is amazingly strong, tough and resilient. He's strong enough to lift about 10 tons and actually regenerates- no chance of that happening in D&D without items, though. There are hints to his having other demonic abilities that he does not use because to do so would bring him closer to being like the demons he has rejected.
By making him a Hybrid as opposed to multiclassed, he'll have access to certain abilities that will fill in for some of the over-the-top physical stuff that simply won't be achievable in 4Ed. He'll be more distinct from being a pure Hellboy knockoff; the Hellraiser aspects will make him even more alien than just another Warforged.
That said, I'm still going to take a closer look at mneme's suggestion about Eldritch Strike. (Where is that, BTW? I'm not in front of my 4Ed PHB at the moment, but I only recall Eldritch Blast.)
4) I do intend for Box to get one or more components over time, though I'm not quite sure exactly which ones and how I'd like to do them.
I'd like to get that "lamp" mounted in his chest for a bit of an "Iron Man" vibe, for one (as well as being useful).
But some of the other stuff? Ideally, I'd envisioned his components as appearing from and disappearing within his body as he reconfigures himself a la a LeMarchand box:
*whirrrr clack hummm* a flash of light and a hint of ozone & sulphur. But from what I understand, components are not concealable. They're either on the Warforged and obvious or not part of him at all.
(Hmmm...perhaps for more Hellraiser flavor, he should use a spiked chain...)
5) OK...did 4Ed do away with arcane spell failure completely? I've been looking to see if armor would disrupt a Warlock's powers and didn't see an answer. Then I looked at other classes and didn't see one there either...
Of course, I'm just flipping around in the books- my system mastery of 4Ed is still low.
6)
It's pretty obvious that knocking stuff off the low end of classes is the right way to go...
To you, maybe, but I strongly disagree with that design decision for a variety of reasons.