I think mostly people don't do needle wheels because of ease maybe. Then you have to take a bioball apart (at least that's what most people use) and then rig it up. Plus then you are only limited to one pump (chances are you modified the impeller of the pump you were going to use...and what if it doesn't work?) Impellers aren't cheap. Here is a picture of a large spray injection skimmer I made.... There is no beckett or venturi....very simple design actually... and works well..
Hope this helps, I don't know if my reply was correct because I've never bothered with needle wheel skimmers. I've owned them before but wasn't sold on them.
Des