> Leo is a British/American boat builder ...

... and a sailor! :)

> And even on this much smaller project, yes, steam boxes were important when forming the new hull.

Are you sure? I don't remember them using steam boxes for the Tally Ho. I think they use sawn frame construction instead of steam bending them.

Maybe you are mixing it up with Acorn To Arabell? It's an other youtube channel who do definitely steam bent a lot of frames: https://www.youtube.com/watch?v=zOFP4Rop4u0