Your going to be hard pushed to get a decent fitting footprint to match so id get the dimensions,a big piece of tarp, cut it to size yourself and put your own eyelets in for pegging down.As for carpet,again check the dimensions and find a tent to match,or as near as.Off the top of my head, try the Outwell hartford XL. Good luck.
Agree with using a tarp and as for the carpet you could try some breathable groundsheet and cut it to shape
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