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I knew a guy who modeled an Arachnarok Spider with a huge rickety tower on his back to represent a Folding Fortress.

...which he then stuffed with something like 300 goblins, the Spider Banner, and a cabal of Shamans to carry the Dispel, Hex, and Feedback scrolls to keep Dwellers at bay.

It basically never worked, of course, but it sure was funny.

Beyond that, I usually drop the shields on my Night Goblin blocks (2X40 and 2X30) and give them bows.
A 6+/6+ is nice, but I'd rather have the potential to reach out 16" and pin-cushion those annoying little units that are trying to get in the way of my annoying little units.
Plus, with war machines, Squigs, and chariots, I can sorta' castle-up with a Night Goblin mine-field.

If you want to be really tricky, I've had some luck with small blocks of regular goblins, with shields, bows, and Skulkers. Put them on your flanks to pepper the enemy for a turn or two, then charge into the flank with Sneaky Stabbin' for 16 AP attacks that re-roll hits and misses. Not bad for 100pts + a shaman.

Yeah, there's a reason they'd never allow such things.
The second big drawback to the Fortress-concept is that it has such a limited range (the first, of course, is Dwellers).
Even if the Tower could count as a 15-level building, I'm sure most armies could stay out of range easily enough. 16" is not very far.

Now, with Warplock Jezzails, 36" will carry you a lot farther...