I need to repair some rotten core on the foredeck portside (about 2.5 ft by on 1 foot) and side deck on the starboard side (almost the same size). Also some slight delamination on the starboard side deck. If I remove some skin, where does one get the balsa or is there better wood to use? Does it come in various thicknesses? Can you just use some type of epoxy filler. I have read the previous ideas and it helps. Thanks in advance. Bob