That looks interesting. It might be a little cheaper than ExpressPCB, but looks a lot more complicated for me to get an order in, as all my layout files are in ExpressPCB format, not Eagle or Gerber.
I took donations in the past and burned through all of it without a lot to show. I really didn't feel good about this, especially since the end goal was for me to make some money, even it it's like minimum wage.
If you compare what a Zephyr board does to something like Method's HVC/LVC boards and the pricing per cell, I'd have to charge quite a bit for it to be comparable (for fully built boards). There's no way I'd have time to build these, so at best I'd be able to offer bare boards with a parts ordering list and some instructions.
In the past there were some people who built up the boards and offered fully built units. If you're organized and have reasonable soldering skills, it could probably be done fairly efficiently wth some practice, but there is still quite a bit of labor to fit the box, heat sinks, packaging, shipping, bookkeeping etc., so the labor cost would still be high. Could be a good side job for someone with the right skills.
I'll have to try and come up with a cost estimate for bare boards. This will have to be the actual board cost plus quite a bit extra to go toward repaying the immense development cost.
But one of my main objectives is always to make products that not only work but are affordable enough to be widely adopted. Any bozo can build a fancy BMS for $1,000. That's not what I want to do.