I've been meaning to make one of these for years and in amongst everything else I found a bit of time to do it the other week. It's a simple build of a box with a very holey lid - it's ace owning a small CNC as this is precisely the kind of job it's worth its weight in gold for. A quick measure of my cheap shop vacuum nozzle diameter (an Argos special that has lasted years despite abuse) and the CNC cut the side sections to match. I'm experimenting with recycling milk bottles at the moment and using a hand held heat gun. It works well and pulls a strong seal around objects. I fancy trying to make some lightweight small nosecones next to see how they compare in weight to the very thin walled 3d printed ones I have made.