Gordon weird wrote:
What do you think of the idea of fabricating a holding tank from
plywood, FG cloth and epoxy as suggested by AMPowers?

I think it sucks.

I built a 65 gallon holding tank using epoxy and and double bias
knitted glass.

You won't save any money.

You will reclaim space since you can custom build a tank shape to
utilize every cubic inch of weird shaped space using the "lost foam"
process.

Reclaiming what would otherwise lost space on a boat, has a value that
is tough to estimate.

The smaller the boat, the more valuable the usable space on a cubic
inch basis.

Lew