Here is what I have spent so far (replaced transom, stringers, deck, carpet, and most of the upholstery). I am sure I forgot a few minor things, but this should cover most of it.
Stringers, deck, and upholstery:
$152 Wood - (5) sheets 1/2" CDX plywood, (6) 8' 1x 6, (6) 8' 1x 4
$21 Foam (noodles...