Hi Casey,

Welcome...

(Sorry for the rather negative review in advance...)

As to your idea, I must say as a Timberwright and a Designer as well, I can't relate with such an environmentally unsustainable material as modern OPC being employed the way you have suggested with a timber frame infill or cladding system...

Besides its responsibility for a minimum of 25% of our greenhouse gases globally and worse in some regions, it is a dank and moisture holding material leading to mold issues in many of its applications, and as our melting infrastructure indicates it is anything but durable in the modern context, unlike the natural cement of millennia past...

I can think of several masonries like affects that do work well with timber frames not only in the material efficiency perspective but also aesthetically...

Lime and/or clay plastered Straw Bail, Kubbhus style nodding, light straw clay or wood chip, cobb, or even just simple stone. Add a thermal break of 50mm think mineral wool (minimum) then how would have a very efficient and unique structure...