There’s a recent thread discussing the subject manoeuvre for an XK140 OTS, which indicates it’s not the same for the XK120 OTS. I pulled it off last April, during which I took video, but only got around today to editing it all down to a reasonable length and uploading it onto YouTube. The process involves using a shop crane attached to angle iron cockpit bracing to very carefully lower the body in small increments while shifting the rolling chassis, supported by wheel dollies, into position below.
Offered without recommendation, and the usual caveats about the need to be very careful and taking your own personal responsibility to avoid damages and personal injury.