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Mike
Have a look at (I think) Starkler's post "rough as guts dob fan".
He's used velcro to attach his to the rear of his tube.
I was lucky that my backing plate arrived already screwed to my mirror cell. So I use the same screws and holes to attach to my mirror cell.
As you can see in my mirror fan pic I cut 3 holes around the plate's rim so I can get at the collimation screws.
I alsi drilled holes for attaching the fan to the backing plate. The central hole (for the fan) was cut in a drill press using a circular metal cutter.
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