reason I ask for an amount you are aiming for is... the required items you listed the end user needing are already around $2000 USD (3d printer, router, tools, etc...), or am I reading that incorrectly and you will be providing everything pre-manufactured with some assembly required?
are we looking at 1-15K, for already completed parts...
or
are you planning on just releasing the plans for the user to create everything with their own equipment...