It is generally not too bad to convert for shapeways. The main restrictions (for the WSF) material is that it needs to be at least 0.7mm thick to be strong and that the minimum detail that will show up is 0.1-0.2mm. There is also a nice community on shapeways to help "debug" your file if you run into problems.
Interesting, I read somewhere that it was 2-3mm thick. I can hopefully save some more cost with hollow minis. I uploaded various Shiva BBs to Shapeways, but the costs are brutal. Kind of like Space Fleet Omega, FASA never created a line of capital ship minis for the Renegade Legion universe.
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TAZ