Law of diminishing returns is exactly the issue I am running into here.
I think that Teej and someone else were onto something with their suggestion. For you to come up with your own body/head/carrier designs and then do the intricate magic that you are already doing to existing hosts. Another upside to that would be that you wouldn't have to undo things, but just complete what's left to be done. Also, the idea that you could have the same body for different sizes/applications and then make new complete heads for them as time went on would appeal to quite a few customers I would imagine.