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I've attached a photo of a Malaise trap that I run frequently in our partially wooded but basically urban yard. It was stitched up for me by a friend based on a pattern that I drew but is basically a copy of another trap that I bought from a US supplier called "Bioquip". They're VERY good and helpful.

The main issue with the design seems to be coupling the collecting head to the trap. In this model I used a 4-inch PVC plumbing coupler bolted onto a vertical pipe that supports the front of the trap. Into one end of it I sewed the cloth of the trap (covering the entire dodging junction with "duct tape") and into the other of which a variety of 4-inch things can be placed.

Most often I use plastic "2 liter" soda pop bottles (4 inch diameter). With these I cut off the top, reverse it, and insert it into the bottom to serve as a sort of funnel. They're cheap and easy so I use several in a day so that I can tell what was collected in the AM, 12-4 and after 4PM (say). At home I pop them in the freezer. In the field, I put a little Ethyl Acetate on a twist of absorbent paper and pop it into the bottle for a while before transferring the bugs to a killing jar or a jar I can put on ice.

I've used the PVC - plastic bottle device with some success for emergence traps and on cardboard boxes I can drop over bits of carrion. But I'd be very interested in hearing how other people do this sort of thing.