34-year-old inground 36'x18'x8' vinyl pool wood frame repair

A few of my plywood siding boards have begun to push inward between a quarter and three quarters of an inch.

My repair plan is to pull down the liner in the repair areas, remove the plywood siding boards and gravel backfill. Rebuild and repair the old wolmanized support structure, reinstall the plywood siding boards in the original (flush) location and replace backfill through an access opening at the top of the plywood siding. Last, reattach the backfill access panel and re-install the vinyl liner.

I am interested to know if anyone has experience with this type of repair?
PoolChuck