Final piece of the front assembly is now dismantled, and essentially if the weather was warmer then it would be on to cleaning and painting and reassembly on the new chassis. However, there are still a few small things to work out before then, in any case.
Here's a view of the front springs, and their shackle plates and bolts, with the new U-bolts and things in the box at top, and the new bushings at the bottom.
Here's the new mystery. The replacement bushings I purchased are not the same diameter as those in the springs. The new ones are 3.05 cm in diameter, which I understand is correct, while those in the springs are along the lines of 3.5 cm. Hmm, something else to solve.