There is a company that make high end SPARC based UNIX laptops: Tadpole. Perhaps they will be interested in manufacturing PowerPC laptop for running Linux, AmigaOS and MacOS.
TadpoleProblems:
1. Is G3 or G4 suitable for Laptops? What about power, size and thermal problems?
2. Is there any PowerPC chipset suitable for laptops?
3. What about the video display chip for LCD?
4. WHO will buy such product? What is the size of the market?