Having taken delivery of the kit, I couldn't resist a bit of a poke around in the box, reading Fred's instructions and understanding the thinking behind the under frame and brake gear. First impressions are very good indeed, the quality of both Fred's pattern making and the casting from his masters by CMA is really as good as it gets. The "veracity" of the axle boxes, spring hangers, solebar details exceeds anything I have achieved and the believability of the corrugations, looking utterly "pressed" is great. The chassis is designed for compensation with inside bearings (provided) which wouldn't be my first thought but I'm going to build it just as designed.
The other parts are equally good I think, my only reservation is the "instanter" link which looks too big to my eyes and I think will want replacing or filing down or something.
You have to make a plastikard "shelf" on either internal side of the sides, which I have done, fabricating an "L" section with triangular strengthening fillets, which I have epoxied inside the body. There has been very little flash to be removed.
Here's a close up of the superb axle box and hanger casting.