Okey. I had the need to get a skimmer on my tank (which I am still keeping hush hush) and for the best results I needed a recirculating skimmer. Now, I do not have R3000 for a skimmer, so I decided to ask here and there, steal with the eye where I can and then I finally came up with this.
It cost me around R500 in total - including pump etc. One drawback is that it is not clear, so I cannot really see what is going on in it. I also did not use the best fittings one can find probably, but it seems to work just fine.
I would like to use this as a prototype and soon build one from perspex. I do not know much about skimmers as I am a biological filtration dude, so I have now only learnt about pin wheel impellars etc. On my new design I will have all this gadgets fitted, and see which works best.
Please feel free to comment, and critisize, as I am not the expert on skimmers at all, but this one works well for now...
The Skimmer:
I bought a 160mm PVC pipe from Builders that cost me R88 for one meter. I then chopped it down to 450mm for the skimmer base.
Then I drilled a 25mm hole at the bottom and fitted a 25mm bend. This was then connected to the pump and the venturi inlet was also fitted to the inlet side of the pump.

From the side.

From the bottom.
I drilled a 50mm hole for the intake that would be connected to my DT's 50mm outlets. Just below this, you will see the second 25mm hole that would then be the outlet from the pump, blowing bubbles into the chamber. Here I also place a 25mm 45deg bend, and slightly tilted it downwards before sticking.
For the outlet, we drilled a 40mm hole, and connected a 40mm pipe via a bend upwards. On this 40mm pipe, we placed two O Ring rubbers.
Then we placed a 50mm pipe over that, in order to slide up and down the rubber o rings. This will now allow me to adjust the level of water inside the reaction chamber.
For the bottleneck inside the skimmer body I bought a 150mm funnel from Builders Warehouse for R9.99
Then I cut off the pipe end of the funnel (THE BIGGEST MISTAKE I MADE... I will say why at the bottom...)
Then I just stick the funnel inside the reaction chamber and sealed.
Here is the skimmer then built.