Wouldn't it be far cheaper and simpler to run Amithlon on a currently-produced notebook? Don't get me wrong, the idea from that website is nice, but... Is there really a market for a 68k Amiga, at the price of a laptop? It might be even cheaper to produce a laptop from a standard A600 or A1200 mobo.
I am typing this message from an A4000 because I already own it for quite some time, but if I was to pay expensive for an Amiga nowadays, I'd think carefully.