I would carefully saw through the wooden slates so that you can easily remove the cattleya's and healthy roots from the all too wet prison. You can leave and keep the the pieces of wood where the roots are too firmly attached, provided the pieces are not too big. Then find a new suitable container (earthern pots with many holes or baskets are the best as they allow for good air circulation and drainage), repot the orchids one by one using preferably natural charcoal as truly an excellent natural media and some chopped coconut husks/fibers (NOT compressed bar-b-que briquets!). When finished give one good watering and then keep completely dry for 10-14 days in a shaded place as you live in Florida (similar tropical climate as we have in Thailand) to stimulate new root growth; then gradually expose to a place with good light and some sunshine! Good luck!