FWIW - somebody over on THT had a bunch of end grain balsa (1/2"??) for sale cheap about a month ago - didn't seem like tons of takers.
I have seen articles where guys made curved, cored shapes with epoxy (slow cure) by doing the 2nd layup using double cut core on a thin (previously made) panel with the edges supported, laying heavy polyethylene sheeting over the top of the completed layup with the edges raised several inches above the piece (think poly edges stapled to a wood frame?) and then put a few inches of water on top of the poly to get the right curved shape. Also seems like the poly would eliminate blush and give a very smooth finish if you get the wrinkles out.
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