Hmmm! Like the look of the Industrial System. I hope they make it as low profile as possible.
256Mb on board with SODIMM expansion. Don't know much about PCI-104
In my opinion the only bad thing is the GPU Unit, the R9200SE core is quite a way more advanced and not much bigger or more costly than the R7000 although don't know about liciencing issues. A R9600SE would be even better! Considering the GPU can't be upgraded should go for the most upto date possible.
Possible basic specs
a)G3/600MHz, 128Mb PC133, Radeon 7000(ve)32Mb
b)G3FX800Mhz, 256Mb PC133, Radeon 9200SE 64Mb
c)G4/G3VX*1GHz, 256Mb PC2100, Radeon 9600SE 128/64Mb
*G3VX Is my own invention IBM 90nm chip based on G3GX (without bugs!) and an integrated Altivec Unit.
Having established specifications allows S/W designers to have a firm base on which to program for. Just like games consoles and the old A500 days (just make sure your APIs are future proof)