Up here in the tundra I did the floor of my unheated crawlspace cabin floor as such. standard 2x8 floor joists with small wave gavl barn roof metal on top(this made up my rodent proof under floor layer. O n the metal I nailed 2x3 stringers perpendicular to joist at 2' cc spacing on edge giving me 2" subfloor and metal underfloor. I laid 2" hi density insul board between stringers. I went with 3/4" 4x8 T&G ply for subfloor because I was ceramic tiling the entire floor(porcelain tile). Its 25 yrs going and no issues with floor. Cabin is unheated except when there in winter so it has done well thru 100's of heatings and coolings. Even when it is subzero only a few hours warm it up with the wood stove. Over half is exposed to passive solar so sunny winter days it is toasty. I'm sure you would have no problems scaling this design to whatever your climate needs.
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