blykins,
Would you post a pic of your setup as supplied from S.V.?
Just my inner geek wanting to see it.
The only thought that comes to mind as far as your flanges go, is the completed shaft/ flange assemblies will probably need to be cut in a lathe so the flanges are as close as possible to 90Deg to the longitudinal axis of the shafts. Otherwise, over time the wobbling shafts will try to crack the flanges off. (if I understand correctly what you are planning)
Steve