if it helps?
Harold Hall i ( I think) Issue 3 of Model Engineers Workshop described - with plans- a pair of castings form College Engineering.
Having said that, I bought 30 kilos of scrap metal (??????) as a Lucky Dip job and there is loads of 'angle iron. Anyone with access to a welder could knock up various sizes to suit things on the faceplate or catch plate.
I have no idea what Hemingwaykits offering is like but kirk's quality is high.
However following a somewhat waffling set of comments about 'ancient workholding on bloody big machines when we lessr mortals have quite small stuff, might I suggest what the older brigade have used and do use now?
Ivariably, they always had a chunk of metal- cast iron, mild steel or whatever was to hand and mounted it to fit oin the boring table which could be drilled, tapped, modified or whatever to hold irregular holdings on all sorts of things and when 'worn out' made another one. The late 'Martin Cleeve'- Kenneth C Hart made up his block from fabricated mild steel sections so that it contained Myford slots on the top and the working side. I recall that he published it in an early edition of Engineering in Miniature and there is a listed item in the Blackgates catalogue.
Harold Hall writing oas editor of Model Engineer's Workshop published a large number of his own clamps and workholding accessories in book form. I have a copy 'somewhere'.
For those who want to follow the topic, the internet- the UK version for a whole raft of useful ideas that make life so much more pleasant.
And recalling tht it is a long time since I had my little Mig out, results need not be pretty as lommg as they bwork
Best Wishes. Let us see other ideas
Best Wishes
Norman