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Rowland's point was a good one. It was too big. I've been able to modify it though. It was not difficult really - a light touch with the angle grinder (is thee such a thing as a light touch with one of those) and I was able to reduce the height by 40 mm and the weight by about 300 grams. There was a metal tub insert that I removed leaving only the polystyrene foam insulation and it is apparent that I could very probably further shrink the box's height. I'll defer doing that until I get hold of a suitable air-to-air assembly and determine just how to attach it. But I'm guessing I could reduce the height by up to another 30 mm. That'll shave more weight off it as well. With a bit of luck I'll get the weight down to about 600 grams or so (without DSLR).
That could make this a viable project after all.
Peter
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