I don’t have a design to share but it really comes down to your own process. If you have access to “custom building” your own. Design it to fit your process. Take a brew day and study your own process and look at what is efficient and what is not. That should give you a starting point.
[Insert obligatory “wood burns” cautionary statement here]
Turn it into a beast you are willing to show off and produce beer with. Not specifically in that order.
Post pics when it is done, so we can drool over it. ;D