Schpankme,
# I think I will increase the outer diameter of the stator from 100 to 120mm that is the size of a CD. I need it to be a little bigger because of the shaft and bolt diameter issues. I do not know about the thickness yet, it all depends of the material and cuttng costs. I think the thickness will be 60-100mm, that is 120-200 plates (if I will het them at 0,5mm thickness).
# I do not know if there is any off shelf motor that could be perfectly suitable for this. Steven tried to convert a simple induction motor core, but we do not know the results yet. As you can read in previous posts, such a off shelf induction motor stator core is a real pain to wind. Also the poles could be too close together. Tomorrow I will see what the guys form the motor rewinding company will tell me, maybe they have something that is more suitable
# You are going a mile a minute. I haven't even built one myself yet, so I can not tell you how much the shipping of such items will cost. I haven't even thought about selling these cores. At first we must built and test one motor an see how it performs, that could take some months.

Thanks,
Jetijs