The way you have the entire trap set up is wrong. Look at the Screwfix linkmon the previous page, the trap is the lowest part and doesn’t rise up above everything else. All them pipes WILL get blocked.
I'm still on there, apart from the layout it doesn't seem to have changed much (to me anyway).
Does seem quieter without croppie, APP and that, but Dan and someone called Lou are starting loads of threads to try and keep it going I think.
It will work, obviously not designed for the job and the proper cutters will be much much better. I've used it once when making a manifold just to pressure test my pipework (never for the actual install) it very slowly cut it and held up to 10bar on the test.