Seeking yurt winterization advice

[Rich Brereton]

My wife and I put up our yurt this year in southern Maine where winter is cold and wet -

Shelter Designs

30ft, snow and wind kit, Arctic

insulation

package. We hired a builder/GC to build the platform, and he recommended we build some kind of enclosure around the the pier foundation (see attached photo). This would create a crawlspace and give some extra temperature protection to our water line and drain lines (with the added benefit of losing less heat through the floor). I'm envisioning doing this with plastic sheeting stretched on frames built from 2x4s, one frame for each space between piers. Before getting started I'd love to find some resources, advice, photos, etc. to help guide this project. I've been digging through the threads here but I wonder if some of you might be able to point me in the right direction.

It's also been recommended to me to build boxes around the water and drain lines down to grade and fill with

insulation

. This seems like a simpler project than the above, but any guidance here would be awesome. Thanks folks!