I'm not sure quite what you have in this system, if even the pipe and wire for branch circuits can be reused, nor do I know if you have nay other existing equipment; but do consider just getting constant circuits - and not many - to the lighting positions and acquiring all portable gear with LED units, local relays, and wireless DMX distribution. Besides being able to do it fairly quickly with the lowest possible electrical contractor costs, you get a nearly proportional amount of function out from your investment rather than a lot in infrastructure and little in lights and its very easily relocated if you move again.