Hi Paul and all, Yes I put images of the two types about 5 posts up that were a little clearer .
Depending on what model Turner mower you are fitting the catcher on,you would make the bracket fit that model.
The images we now have show the catcher side that attaches to the mower is a pressed shaped piece of sheet metal.
If I was making the catcher I would make a bracket like the one on the polyurethane catcher ,no point making the catcher unnecessarily difficult to build from home.
I think you can work out the diementions for the catcher from the last catcher images fairly easily.