I'd be interested in SharkPPC if it gets released. It would be nice to have a fully compatible unit in 1 tower.
I would boot to OS3.9 partition/hard drive to access the classic stuff, or boot to OS4.0 partition/hard drive for the latest PPC offerings. Of course, this would be nice in theory only, as SharkPPC as itself and its OS4.0 compatibility are all unclear and unconfirmed.