Thanks for the feedback.

Just finished cleaning the cores with soap/water/brush. They look alot better now.

Next I intend to sheet them with 1/16 balsa and Southern's Sourghum. I'll fill in the missing foam from the edges after sheeting.

I've never done this but I think that crumbled foam and a glue binder will do the trick. Epoxy or something thinner like Elmers/water?

Anyone tried this?