I really liked the Kronos / CNCRouterParts.com setup.
My personal opinion is that a 4×8 table is ideal. The space constraints are real, however, and this size router would take up nearly the entire woodworking area.
To help offset the cost, a small fee per use might help cover some of the machine overhead. This is probably an unpopular move, and may detract from gaining additional members. I think machining capabilities will really bolster the membership and allow the space to expand.
There’s always the Shapeoko 2 approach, which has low barrier to entry and can be scaled up with new makerslide rails and belts. This may be an interim approach until the space matures enough to scale up to a larger facility.