You'd want to use end-grain balsa which may be difficult to procure in a thin sheet, and if possible, a big pane of very clean and lightly waxed glass to do the layup on to get it closer to perfectly smooth.

If you're going to go to those lengths, you might as well do it properly and use vacuum and bleeder cloth as well. Or pre-preg and a curing oven..

I'm sure there'll be issues, but there are issues with any method!

(P.S. It might be less expensive to buy a commercial composite boat than go through all that!)