I would love to build one !
The Model Boats magazine article mentions -
three jam jars are bonded together and then bonded to a ply frame work using 'builders high strength transparent adhesive',
can I assume we are talking Silicone Sealant? of which there are many variants??
I believe there's a special fish tank high strength silicone used to bond the corners of glass aquariums etc?,
any submariners like to advise please??
Paul