At this time we are not offering these models in 6mm.
That being said, a 6mm range is firmly on our list of 'to do'.
As for when, at this time we can't be very precise. A lot of it will depend on how well this campaign does. If it gets too crazy we'll be very busy getting molds made and pulling casts to fill pledges for quite some time. If we only break the lowest funding goal we may not have the capital for creating entirely new master molds in a new scale, and we may have to depend on webstore sales to generate that funding.
Bear in mind that you can use most of these pieces on a 6mm game table with little problem. If one were so inclined, one could easily modify the sizes of doors on our buildings with some plasticard or putty to make them look just fine next to 6mm miniatures!