"TILE" inside a plywood build???

[CA-Delta]

As has been said , the tank would have to be heavily built.
I think once you add up what it will cost you will find it is more expensive.
On the other hand if you are set on seeing tile as an interior it could be done.

 

[L~C~G]

I would not even consider that. There is too much that could fail.

A shower being water tight and a tiles be constantly immersed in water under pressure are two very different things. A lot of guys struggle to seal ply tanks with the best products money can buy.

I dont see that it would be possible to seal ten times the amount of seams on a porous surface.