Hello Colin, and Welcome tom the Forum.
I have a Chester Craftsman lookalike (An Engineers ToolRoom BL12 -24 )
It is effectively a Craftsman with a different paint scheme and dual dialled instead of Metric only graduations.
I have had it since September 2003, and am quite happy with it, having used it for almost all my work. It has turned 6 1/8" diameter cast iron in the 4 jaw chuck, at one extreme and thinned the heads of 10 BA bolts in the 3 jaw chuck at the other., as well as cutting several .5 mm pitch threads. The coarsest was a 4 mm pitch, but my lathe came with a 30T gear as well as the standard 40T and 32T gears.
I also made a 80T gear for the input to the Norton box, to halve the feed rate.
So it a quite a versatile machine.
MEW published an article on it some time ago.
At my request it came with a VFD fitted, so only has six speeds, (Three on the belts and pulleys, plus the Back Gear option )
It did have one silly feature. There is an oiler for the Apron controls, hidden under the Cross Slide handwheel where it was inaccessible. I removed that part of the mechanism, removed the oiler,blanked the hole, and fitted another 6 mm dia oiler on the side, where it is accessible..
I also made the bolt for the Fixed Steady captive. otherwise fitting it tends to need more hands than I can muster!
Otherwise, am quite happy with it.
This assumes that the BL12-24 came from the same factory, and to the same level of quality as the Craftsman.
If you want to use a Vertical Slide, fitting one from a Sieg SC6 only requires one simple adaptor.
HTH
Howard