You'll also need 4 stainless steel threaded rods you can source anywhere to push through the 4 channels that line up when you put them together. That gives it lateral strength and you can mount it either top or bottomside
You will also need a bottom plate below the last segment to protect the inner tube channel (where the sensors should be placed) from ground IR/UV reflection that could taint measurement results
It's up to you to place a fan above the channel (in areas where some forced convection is needed to get air flowing through it) - in most cases the design was made with natural convection in mind, so that warmer air in the outside channel would rise up and therefore also triggering air movement within the channel that is fed from the bottom.
Corrections, Updates, Enhancements and PRs are always welcome.
CERN OHL 1.2