I made up a box for the 150mm F8 out of 12mm particle board and 70x45 pine. Knowing how particle board turns into breakfast serial if it gets damp, lots of waterproof estapol was applied! Lined it with 1" thick foam. Turned out to be pretty darn heavy. The only thing I'll have to keep an eye out for is ants getting into it. Did I mention ants? I seem to have billions of the little buggers.
Dew is a problem I haven't solved. A few months ago we had several superb nights in a row but after an hour or so, everything was starting to get pretty wet. While the 12v hair dryer can keep the lens clear, it doesn't help the body of the scope/eyepieces/ipad/me & gear from getting soaked.
I just resigned myself to the fact it wouldn't be a long session and to quit when I thought appropriate. Being a roll off roof in two parts, I can position the roofs to offer some protection. If the scope got really wet, I just left it on the mount under a sheet to dry off over the next day before I put it back in the box.
The other alternative to a case could be some of those long sports bags or a soft keyboard case? I sewed up a couple of simple bags for my 100/80mm scopes with enough room for plenty of padding - I think I used an old mattress protector wrapped around the scopes.
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