I would like to see some suggestions on wiring up the switch.

Rating of 3 stars is sad to see. Drop me a note what is the main reason for such disspointment with this particular project? It helps a lot and thanks in advance.
What would be the best way to mount a linear rail or a way to test toolheads?
@IconicFAB I was hoping to have one rig, so a combo of the two.
@shaxs_679505 That's inerersting idea, let me sleep on it a bit.
Unfortunately, the linked din rails do not fit. Does anyone have a model that fit this profile? Even if it's not specific to the rig so that I can use it for a remix?
@shaxs_679505 I will look into it, it seems that I need to order test for the reails you are using as there are no other way how to understand dimensions.
Could you please drop in a link to the rails you are purchased?
@IconicFAB I used the link in your description: https://www.aliexpress.us/item/3256802732351745.html I bought the 50cm/500mm rails.
Excellent workbench for prototyping and testing. A v2 suggestion, add features for aluminum rails. They might end up being a tad more rigid, and they’re cheaper.