Slowly grind your N. Bearings so they are parallel to the table, grind the S. Bearings parallel to the pivot axis. Glue these to the ground bearings with a flexible glue. Cut a ground board much the same size as the top, it needs some extra room on the N. end for the motor drive. So much for the woodworking, now the drive. With this radius determine, from Peters' calculations, the pitch needed for the threaded rod.
Wider pitches give better contact with the threaded rod.
If the position is off, you can move it N or S. to compensate. For a minimum height table, the big challenge is to make the motor centered between the baseboards. Click for large image. Click for large image. The motor will need a gear to drive a gear on the threaded rod.