Here is another "FWIW" item.

I followed the manual when installing the rear pressure bulkhead.  When I got to the rear armrests, the manual suggested leaving 3 inch spacing  between the back of the armrests and the lower rear seatback, just in case the seatback ever had to be removed.

I decided that 3 inches was going to be marginal at best, so, in addition to the 3 inch spacing,  I made the last 5 inches of the left armrest removable,,,,, just in case.

Yup, it took all the available spacing  to get the rear seatback out of the airplane and even then, it was a tight squeeze.  The upholstry was a problem I hadnt counted on.  Since my upholstry is glued in place,  the extra spacing spacing was necessary to avoid damage to the upholstry.  Maybe this idea can help another builder,,,,just in case.   Regards, Bill Hogarty