Bit of an improvement from the 'before' previous pic.  Rotting wood chiseled off then ground back.

Foam in place. Lines on foam position the holes that allow resin mix to permeate thru.  Then original glass layer replaced and weighted down before the resin slurry started to cure.  Next day we had heavy downpour and our hard work thus far was justified. Glad to see the end of the rotten wood core.