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Alaias are really easy to shape. If you can't find a ready to shape blank you can glue them up without too much hassle. For best results, don't use PVA, woodglue or even gorilla glue unless you are going to permanently seal it with resin or varnish.
If you are only going to seal the wood with linseed or another oil, you should use marine grade epoxy glue. tongue and groove is not necessary if you use the right glue.