Thor, or should that be Zeus?

[Desertboy]

Getting them to work as single NC switches is fairly easy on the CS Labs / Mach 3 setup.

Im trying to work out how to wire them in series and how to mix between limit / home options.

Another way is to wire something via the E Stop circuit for limit switches and not actually use the 'limit switch' pins available to Mach 3.

You should be fine to wire them in series no problems but only if you use them as Normally Closed, if you use them Normally open they won't trigger! Normally closed the circuits is flowing and your detecting a break it doesn't matter which one triggers. Normally open the circuit is closed and unless you trigger both microswitches at the same time (Which can never happen in real world use) the circuit can't complete.

There's no real power going through them so wire from one to the other so should be no need for anything else.

If I were you I would wire a 2nd set of limits to the Estop regardless as it seems more reliable than relying on the software and you really can't afford a crash.