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I dont know, not done any slave connectivity before. Im sure JazzCNC or others will offer some guidance.

If you aren't sure and don't have a good means of determining that any rail is straight then you're guessing and are thus stuffed anyway, likewise level and square are a guess unless you measure...

I have never made any v-rail myself, so i can't offer any advice.
I only suggested it as a low cost alternative for you to consider.

Your best place for information and advice would be the...

I don't think that's a very good design for many reasons.
If you are going to use it for a router, it's a very bad design as any debris(dust, chips,swarf etc.) would cause big problems.
Also for...