What limits you of course is your scale of production. Even with the automation you have the amount of hands-touching things vs units produced is still very high simply because the market is not (easily) there to take the next step. If with several x more sales then you run afoul of pricing from Avalon and Buttmain unless you can nail the proverbial niche Home Miner market assuming BitFury comes through with chips.
As you know there IS a sizeable niche Home market but by BiteMe and Canaan standards really too small to properly target. Folks WILL pay a premium for a truly quiet and moderately power hungry miner. It just needs to be designed for that from day-1 - just as you are working on. By necessity they of course will have to be Limited Editions