personally i'm thinking something along these lines for basic fees/dues: (price points are relative so you can get an idea of relations between them)
20~40$ "shop class" required for everyone. orientation, what tools you can use at basic, rudimentary tool safety, acceptable use, maybe 2-4 hours plus a handbook.
~20$ 72 hour access. for folks who want to do a project or two a few times a year but can't/don't want/need/afford anytime access.
30~60$ a month of 24? hr access get 10$ off first few months to recoup your class fee. retake shop class if you lapse for more than 2 consecutive months.
300~600 a year of 24? hr access payable in 3? 4? monthly installments, includes basic shop class and two advanced shop class.
anyone who's membership lapses for.... more than 3 months? must retake the basic shop class (updates/changes in tools/ safety things, etc)
advanced shop classes would be things like safe use of the big wood shop tools, or training to program a CNC rig, things that you could do serious harm to the facility or yourself if you don't have a notion what you're doing. nominal fees in the 20~40 range.