Well to be honest the swiveling is not that advantageous because it moves the motor mount or the tranny pad as it rotates. The tranny pan especially needs to stay flat. I should have said that the advantage is sliding, width cutting, price and a small amount of rotation. You actually should attach the motor mounts to the cross member and lower the motor in. Place motor in X Y and Z axis and the cross member will follow, then eventually mark, cut, drill to mount it. I usually let the tranny sit on a jack so it rolls along with the motor mock up and it can be jacked up or down for proper angle. Or it can be slung off of frame with straps. Then design or modify a cross member for it. This is of course after all parameters are examined. I just let motor hang and rest (not bolted to frame) while I contemplate everything. That takes me days of internal turmoil.
