Can I use straw and earth plaster for my bathroom walls in FL?

Hi Permies!

Forgive me, I am new to the natural building world. My bathroom doesn't have walls yet- I was wondering if you had any suggestions instead of getting plywood or drywall. It looks like the picture below. Can I make a straw and clay mixture instead? Or anything you recommend, like putting an earthern plaster over plywood? I'd appreciate any insight that you may have!

Bathroom = Daily moisture from showers, mop buckets, baths, possible kids and visiting folks making a spill, plus humid Florida might equal mold. Relatively frequent renovations to bathrooms and possible kitchen if there is a shared wet wall might mean that you have to knock everything down 'often'.

http://www.greenhomebuilding.com/QandA/cob/uses.htm
It's possible to make it work, just be mindful of vapor barriers and air exchange aka humidity

Good point! But I am going to install a composting toilet and there is no shower in there.

With it being a half bath it makes it simpler. I say go for it. But have a plan in your back pocket, just in case mold takes over and decompose the wood.