Picture this: 5x7 rear mount cultivator frame tube, just wider than the pickup, using 3ph mtg. Ran 4 inch channel irons back on each side of cult tube, to behind pickup, with a channel crossbar attached to channel irons, forming a rectangle frame. Center of crossbar, pipe/shaft pivot with shaft mounted on a crossbar above the pickup. Windrow passes under this crossbar. Front of pickup was lifted by chains attached to pipe lying on side channels- that"s the crude part.... nothing fancy but it worked. Didn"t have time for fancy.
Hyd cyl rotates shaft to get side to side action of pickup. Hyd motor attaches to upper roller on pickup, variable speed thru SCV. Set speed faster than ground travel to pull windrow apart to fluff it. I had 40 acres wet barley, cut with swather, so pivoted unit at each end of field to maintain original swath pattern and width for combine.
BTW- somewhere in archives there should be a picture of it- taken before I cut it up and made the mounted sprayer using the cult frame.