Dean,
I get the impression that you may not have seen all the posts relating to the Worthington pump. Using the post numbers on the right hand side of the post headings starting with post number 531 in my link above, the following posts, mostly illustrated, relate to the complete rebuilding of the pump including many descriptions of suggested machining set ups and a couple of videos of the pump actually running under steam.
531, 538, 539, 571, 574, 579, 584, 594, 634, 639, 644, 645, 650, 655, 656, 657,658, 664,666,674, 680.
This is a very valuable resource for anyone undertaking this task, and, as you said, this information is no longer readily available elsewhere.
Regards,
Frank.