I think it would work with a Troika board but remember it's using a PowerPC 750 series processor. The PowerPC 405-based PDA is a separate project. I'm eagerly waiting the new TroikaNG.com website on the 24th of September.
As for the X86 barebone laptop I don't think it is possible to drop in a PowerPC 405 module due to endian dependancies and bus-timing.
