That's a lot of magnet cost for something that might not work too well for the first iteration. I would suggest going with round magnets, something around 1 inch diameter and 1/8 inch thickness to start. These would be much cheaper for a first design, after which you can order the large block magnets after you have learned from your first motor.
For the stator, I tried to take design cues from the launchpoint motor, basically you want to pack your stator with copper, which means the copper will have to provide most of its own strength. The stator can be made stiffer by filling in the gaps with a high temperature epoxy or something like that. Maybe take a look at JB weld.
Finally, for your overall design, maybe look into simplifying the design, making it more compact, and trying to keep everything as stiff as possible. You probably don't want to hang the rotor off the end of the shaft like that. Maybe look at sourcing your own shaft from mcmaster and bearings from bigbearingstore instead of limiting yourself to that preassembled thing from surpluscenter.
You might want to take a look at the drawings I've posted in my own axial flux thread:
http://endless-sphere.com/forums/viewtopic.php?f=30&t=41776#p714537
http://endless-sphere.com/forums/viewtopic.php?f=30&t=41776#p714656
I'm not saying my design is best, but I have spent a long time thinking about these machines and the best way to construct them...