Assuming a civilization had access to medieval tech, how likely would it be to grow large sheets of SCOBY (Symbiotic Colonies of Bacteria and Yeast,) in order to make a faux leather, by modifying the natural bogs?
For the sake of things while this is fantasy setting I would like to avoid the realm of magic and let's say the bog is a bog more or less how they normally come. But if it seems in the realm of possibility I am completely fine with new crops needed or new variants of a scoby to make it possible.
How much sugar would have to be dumped in to feed it? Would it be a plausible cheaper than leather alternative in said era? Does scoby leather have any noticeable differences that make it better or worse? And to what degree would the area need to changed in order for the bog ecosystem to not upset the scoby making process?