Yesterday I made good progress. The case is now finished and the slider was finished earlier:
I've reused the old crescent-shaped piece for pragmatic reasons, even though it is not 100% match with the text as it's attached with screws, not with a rectangular wooden tenon.
The attachment points for the T-clamps had to be reinforced with brass screws - something I'm not overly happy with:
This is largely because of the pine which I used for the case. While the pine is high-quality it still splits easily. However, this tendency is offset by much smaller weight of the case.
I also drilled holes to the new field frame bars:
The straight field frame bars are slightly wider at the middle to increase strength. This is another thing I'm not 100% happy with, but I did not have 10mm steel available so I had to be a bit inventive. This does not, however, have any practical effect on the reconstruction. The additional strength also ensures that the field frames can take the higher pretension of 350hz.