I've cleaned up and checked alignment (by eye) the six main boards for the fiddle yard throats left and right. The images here show them on the largest flattest area I have at the moment, my kitchen floor. The room where they will eventually be set up is a bit clogged with detritus at the moment:

There is a little bit of warping visible in the left lower centre board, but that will be flattened out once the framing is done:

There is the odd gap that looks worse in the images than in actual reality:

The more noticeable gaps between upper and lower curves are not critical as no track will be running over them, and they're close enough to my eye to be OK:

Again, the slight warping is visible here, but will go once framed:

Overall I'm reasonably pleased at how they have turned out.

Next I have to tidy up the four small spacer boards, then get everything framed up.