My LCD connectors look backwards from the picture. When looking at the fold head on the red stripe is on the right. If I plug them in so the cables come in from the right then the red stripe would be at the bottom.
The steps about the frame being 100mm down the threaded rods should make it clear that if the PSU bracket doesn't line up they will have to move it. Perhaps suggest using the PSU as a guide to check the alignment. Maybe even temporarily bolting it on while they line up the frame.
When mounting the extruder to the X axis I had a problem where the nut above the probe for the M3x18 screw wouldn't catch. I had to wedge an eyeglass screw driver behind it to get it to line up with the screw.
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