Doing some work on the design of the open joint superconducting magrid, which looks like this:
The lids would need to have integrated covers to cover the open face joints. This is turning out to be a challenging design problem. I’ve gotten this far:
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Prometheus Fusion Perfection 
There seem to be a bunch of different ways of designing these joints.
1. Each cover only has joints on two sides that are designed to slip over the curved rim of adjacent sections.
2. Each cover has joints on all four sides that abut in the middle of the joint.
3. Like 2, but adjacent joints covers could intersect each other at an angle or with a kind of fingerjoint. The advantage is that the welding shield profile could be continued along the full length of the joint as adjacent covers interleave.