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Nice work Gordon :D Making your own trap certainly makes good economic sense because the stitching work needed to make the malaise 'tent' and the molded parts in the bottle are always costly to buy from dealers. :)

I notice the photo of the blue Malaise trap shows that it has very short 'roof' parts and a frame to create the shape. With my English designed one the roof parts are much longer - reaching down & out 1/3 to 1/2 of the height of the trap and this probably prevents insects from flying out. You can argue that higher-flying insects won't get in but I think most insects will skim over the ground or flowers anyway so I have never found it to be a problem. The higher-flying stuff tends to be butterflies and Odonata anyway.

Also mine doesn't need any frame - but perhaps yours needed it because the fabric was stretchy? The only solid parts on mine are the front poll and a much shorter stick at the rear. The shape is just created by the guy-ropes and pegs. :)