That's because we're both smart.[I like #6's proposals for the SLAs.

Demolition (Ex)
- Collapse Structure
Demolition (Ex)
- Find & Exploit Structural Weakness
How we set the DC for the structure might be as easy as using the Craft skill's DCs for various types of items... accept these items are quite a bit bigger.
Very simple construction: DC 5
Typical construction: DC 10
High-quality construction: DC 15
Complex or superior construction: DC 20
Magical or geniecraft construction: DC 25 or higher
The number of points of Hardness to ignore? Perhaps every five points the genie's check succeeds equals a Hardness point. Is that enough or too much? Does it effect the whole construction, or just one part of it? A wall or a tower versus the whole fortress.
Is there something in the Hirelings section of the DMG that might apply here? Or do we simply allow the Builder tasked genie to add a +2 circumstance bonus to siege engines used under his direction?Direct Siege Engines (Ex)