Here is how I did one
Built a housing
and put roller bearings in it to fit the nut body
Machined the pulley and put 4 drive pin holes in it that fit the nut bolt pattern
And the way it fits together
and the ''exploded'' assembly, note the thrust bearings on each side of the nut/pulley assembly.
The preload on the thrust bearings is adjusted by these 4 set screws in the motor mount plate
And the assembled view. The little roller ''car'' keeps the lead screw from rotating in use.
I hope this gives you some ideas.