Wood choice for hot tub.

Hi Guys,

I had originally planned on building a hot tub out of something like Larch or Cedar, but it has turned out to be super expensive.

I've read that those woods are required as they have a high and very hard resin content, which will aid water tightness and prevent rot.

As an alternative, i've been looking at building something out of a lesser wood but then fibreglassing and glazing it to make it water tight.

The idea is that you can then use a cheaper wood. What other kinds of wood do you think I could use.

I have two ideas.

1) Build the actual tub structure out of some kind of ply.. and glass that. Then dress it up on the outside with decorative wood.

2) Instead of the composite approach I could just build the tube structure with a single choice of wood.

Any thoughts on this one?

Thanks