Mark,
Are you by any chance looking into making the buildings to use AC transformer power rather than the bulky required transformer or maybe make them available both ways? Would be a lot easier to work with & wire up. For those of us that don't have a permanent layout, it is a real pain in the butt. I think it could possibly increase your sales if being able to wire directly to your transformer like all other mfg. accessories/buildings. Shouldn't be a problem to make the change.
Thanks