I found it a lot easier to insert the Square T-Nuts in the extrusion first, then slide the motor assembly on and then wiggle the screws in place to thread them.
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Test-fit your PTFE tube in the opening on the “top_mgn12_lgx_lite printed part“ because the tolerance it very narrow.
Meaning, your PTFE tube it probably too wide and you will have to drill the hole bigger.
“2x M3x10 Cap Head Screw” are missing for step 24
The two M3x8 Cap Head Screw are not long enough to go into the LGX Lite from the bottom. M3x10 works fine.
Also, even with M3x8 five is not enough as you would need a sixth for the side of the LGX Lite.
But with two M3x10 you will only need four M3x8.
I found it a lot easier to insert the Square T-Nuts in the extrusion first, then slide the motor assembly on and then wiggle the screws in place to thread them.