Choice of lead for lead screw
I've not seen trapezoid lead screws with 5&nbsp;mm lead, you can get 5&nbsp;mm lead ball screws though.

On one printer I use 4&nbsp;mm lead screws to get native 0.02&nbsp;mm resolution (so 5 full steps for 0.1&nbsp;mm, 10 for 0.2&nbsp;mm, etc.). I also geared down 8&nbsp;mm lead screws with a 2:1 ratio (e.g. to use a single Z-stepper driving a belt that drives 2 lead screws), works fine.