On the topic of biggerized versions, here's what Steve had to say in an email today (I trust he won't mind me posting this here):
We've got the basic carcass done for the small and medium upscaled buildings and have three brand new fronts for these as well and we're working out way through the rest so we'll end up with the same range size as the 25/28mm stuff but obviously a little bigger. I would hope they'll all be ready to be unleashed by the end of February (it's always nice to give ourselves challenging deadlines) and at the moment I think this is all on track.
We'll probably just release them as they are ready, so small and mediums at the same time as they share many of the same components and have the same fronts, and then large buildings just after this.