Actually I built one from a tool box from Bunnings.
Basically a galv steel toolbox which you put a divider in, will hold the scope in half and the other half is good for tripod, or other parts. You need to spend about $50-60 to do it but it works fine, with the sole exception that the steel heats up in the Sun so you want to paint it or cover it in something. I did put in pics in the DIY section about a month ago.
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