You never mentioned the volcano! Drain that sucker for all it's worth! Any chance there's an aquifer on the map to play with as well?
It's mentioned in my main thread for The Island of Socks.
Yes, I have a massive volcano, and yes, I have aquifers. ^^
There's also a number of sheer cliffs, and a -really- big cavern system. I had a lot of fun with the advanced world generation for this.
When you capture hell wit Urist McLone, you should do what ^^ he ^^ did with hell. Wall it off, colonize, build a massive sign out of adamantine and wood, grow strawberries, all that stuff.
One dwarf against Hell is pretty much a Bolivian Army ending. Even if he were an uber militia dwarf, one inevitable popped fire demon would melt the poor bastard into dwarven slurry.
That's sort of the point. If the Project Spartan dwarf can conquer the deeps by himself, he'll truly be as the gods that created him. If he cannot, then he'll still be one hell of a dwarf. Either way, he'll be remembered and revered.
Besides, a fully decked out dwarf covered in meter-thick candy with Legendary +5 skills has a decent (read just shy of slim) chance of success. Masterwork or artifact quality, two caps, a helm, six hoods, a breastplate, three mail shirts, six cloaks, two trousers, greaves, gauntlets, mittens, socks, high boots, and as many shields as can be strapped to his body, all made out of candy. There'd be more metal than dwarf by the time he'd be ready.