thanks for providing the type of design you are looking for.
after doing some research online i came across the following picture which seems like an interesting concept
with a but of lateral thinking im sure this can be scale able.
keep in mind this is not something i have designed but found online.
i would say get a piece of PVC / ABS (wide diameter) Pipe in the desired Length, and cut circulate holes in a slight angle place a smaller tube within that and place the basket / net in the small pipe
hopefully this gives you some better idea