Good luck Jarrod
Grinding outside is ok for #80 grit. I would go inside after that.
You can always get larger tiles and cut them smaller. I like to use a dremel to bevel the sharp edges. You could always get a plate glass tool cut by a local glazier.
I would suggest f6 to f8 as being a good target. Think about how much room you have in a vehicle to transport it to dark sites and let that determine the tube length.
Look forward to hearing how you go.
Rod.
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