I used the CMS bearing retainer plate - primarily based on price (it's less expensive than the Wevo bearing retainer).
I'm going to describe the method and steps I used - I'm sure there are other / probably better ways to go about it...
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Install Bearings in the Retainer Plate
I began assembly by fitting the two center bearings (I think these are also referred to a "four point bearings") into the bearing retainer plate.
The bearing fit tightly within the plate and need a little coaxing to get them in and seated correctly. I heated the bearing retainer plate to 250°F (toaster oven works great), and put the bearings in the freezer for ~ 1hr.
Even with the heating and cooling, the bearings still required a light tapping (small rubber mallet) around the bearing race edges to get them fully seated in the plate:
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Need to add some notes to a few photo's - will continue...
Gordo