Cost, heat, design expenses, viable market. Thats why there will never be an '040/060 A600 accellerator. As for connecting to get seperate Chip mem, no point as Chip mem is there for the chipset to access - a mini-dimm slot capable of taking some serious (fast) memory would be fun though.
Having a full '030 is not to be sniffed at, especially as going to '040 cuts down on compatability lots!
