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I suggest that you just rough up your own design from some dark nylon material to get started. Nylon, or something that is fairly tight weave (stop light getting through) and will resist water (you don't want it soaked with dew and dripping water).
Purpose:-
1. Stop stray light getting into your light path
2. Reduce dew formation on your primary mirror
3. Prevent dropped things (eyepieces - yikes! torches, glasses, drinks!) falling on the mirror!!
Just make sure that it doesn't collapse into the light path - but it would have to collapse in a big way to really cause problems.
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