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Im in the process of making something like this for my 8" due to a very wet primary mid way through the night of my last star party... Im using a plastic bucket lid which will be held in to the recessed area of the mirror holder, there will be cut away sections for the collimation screws and it will be held on with velcro...
Being a bit of a computer nerd I have tons of spare fans around ranging in size from 80mm to 120mm.. I'll basically use trial and error finding the right fan to use, obviously starting at the 80mm range and working my way up to find the best trade off between CFM (cubic feet / minute) and vibration. most of the 120mm fans I have run fine directly connected to a 9v battery.. and are very silent..
I'll post pics later this week when its done.
Alex.
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