VIA Nehemiah 1.5 GHz CPU inside Amiga

[asian1]

Hello
On recent TechTV show, they show upgraded Nintendo with VIA C3 800 MHz CPU + mini ITX motherboard, running windows and Nintendo emulator.

Nintendo

The lates CPU for mini ITX motherboard is VIA Nehemiah CPU (1 - 1.5 GHz. There is a company in UK that offer the small system based on Nehemiah.

Is it possible to use Classic Amiga casing (A1200, A2000 or A4000) for the new Nehemiah 1.5 GHz CPU + mini ITX board?
What about cooling and power supply problems?
 
Mini-ITX

If such machine is possible, can the "upgraded" Amiga run AROS, Amithlon or UAE?
What about the speed / performance, compared to AmigaOne / Pegasos G3 or G4?