First, there are 2 versions of the Paterson tank. The one Nodda pictured is different than the one in the OP's link.
I have one that is the same as the OP's link in my hands as I write this. There are a few critical dimensions to replicate and, from what I can see, not realistic to measure with the dial calipers I have. You also would need to measure the angle of that inner ring. Finally, it is a soft plastic (such as food containers for leftovers); I don't know if that can be duplicated with a 3d printer.
That said, it would be great to have a 3d model of each of these lids.