Here's a rough design methodology (ies) I'll be working from.  This will be somewhat flexible depending on how well I'm able to learn and apply them (together) for the project.

Design methodology

• Apply lean principles: minimise muda (valueless activities or waste), mura (unevenness in an operation), and muri (overburdening  of equipment or operators).
• Design for human factors (tailored to me)—within easy reach, easy to access, and easy to put back.
• Safe space to work in (including human factors relating to strain injuries).  Hazard analysis will be done using the STPA method.