UPDATE
Well the IRS is back in the car and what a bitch it was to get it in there. We had to support the car on the IRS (that was sitting on the cups) and then push the car down on the cradle. The upper mounts (inner side) did not want to play. But we (thanks Shane) got it in and bolted up.
Which is why it seems that bolting the empty cradle in first (when doing this job solo) is the way to go. Adding the pumpkin, axles, control arms, etc., afterward can't be any harder!