No, I actually though I’d use it in the winter.
I have bought a spare set of wheels (with aluminium rims, of course) with continental wintertyres (m+s approved).
My thoughts regarding heat is no problem, people survived in the 50s with VW bugs without heating ( and worse roads)
I have also been thinking of making a fuelheated version. The Eberspächer Airtronic D2 uses 7w of 12v power to produce 900w of heating, with only 0,1l pr. Hour of fuel (lamp oil/diesel).
I live on the south coast, so the temperature here last winter were only -28C