Sure, but you'd then be limiting the applicability of the idea quite a lot, which goes very much against the idea that this can be used to chop delivery distanc

Sure, but you'd then be limiting the applicability of the idea quite a lot, which goes very much against the idea that this can be used to chop delivery distances down. I also find it hard to believe that you could find 10 layers' worth of crops this would work with. Two or three, maybe, but I would be astonished by more than that.