Bulkhead replacement

[CapnMichael]

Ahoy all, new to the forum here but have a question on some renovation plans I’ve got lined up,
I got myself a 35 fr 1972 Bristol that was about 95% eaten through by termites, full fiberglass hull, so that was fine, but we had to strip out that 95% of the internal wood, including all but 2 bulkheads,
Now, the issue I’ve hit with putting new ones back in, is that the originals were all one solid piece of ply that was installed before the top deck was put on the hull, and there’s no way I can get that size a board in through the companion way,
What I’ve come up with is the plan to build new bulkheads out of panels of plywood running horizontally, with support beams running vertically thru bolted to each plywood panel and then tabbing this entire structure to the hull and glassing over the seams between the panels.
I know this won’t be as strong as how it’s supposed to be built, but accepting that we shouldn’t ever put the old girl under full canvas after this rebuild, is this a horrible idea? Is there a better way I can rebuild bulkheads if I can’t make it all one piece of plywood? Any advice would be appreciated, I’ve got the time and tools to try anything,