Building up the new bulkhead.
New dimensions are:
Front: 33" tall (bottom of bulkhead to the top of the lid crown) x 62.5" wide
Rear: 22" tall x 39" wide
Main body length: 60" long
Hitch to body length: 25" long
The differential between the hitch at the maximum range of motion is about 8" of travel fer a gap cover between the hitch and the bottom of the bulkhead (14" to 6"). Not sure what I should use fer that just yet.
The bottom gap cover from the end of the extended diffuser to the pivot point of the hitch will probably be reinforced Coroplast fer now.