Hemp is a great substitute for the wood in chip/clay walls, once it's rhetted (decordicated) it's naturally mildew resistant. It's available from Canada at fairly reasonable prices in a short fiber (chip) form.
If I had the time and money that's more or less the direction I would have gone, I'd also include a slow perc radiant barriers. Bank financing can be a problem when using an innovative approach.
I'm still looking the financial miracle that will allow me to use wool or a combination of wool and hemp batts in the attic... The recycled blue jean (cotton batts) is the best domestic product I've come across for this purpose and at 3x the cost of fiberglass it's still within our budget.
