I purchased the bearings last night on ebay, 100 x 608zz . I was impressed only $12 to ship them from California . These are going to be used in the carriages.
I am going to make them similar to Ahren's http://www.cncrouterparts.com
only i will use steel instead of aluminum. They will run on 3/8" cold rolled plates.
the x carriage will be 12" long with an extra set of bearings in the middle, this should give me good stability for the Y gantry
I do have a tendency to overbuild things sometimes so if you see me getting to extreme Please say something, I am open to all criticism. This is a learning thing for all of us.