You can get double slot profile to be able to mount the supported rail but this is obviously bigger and heavier than the 30mm you planed to use.
Any links to the double slot profile?
I would like to keep as much of the build 'Nut a& Bolt' to save time
What power supply arrangements do you have for the powermax? Presumably it's running on a high voltage, high current shop supply? Is it 3phase?
Yep, it runs on 3 phase.
I have a small business unit (400sq. Metres....) and it has 3 phase electrics.
There are plenty of single phase Plasma cutters that would do the same job
Andy