The thing to remember when you vary from the parts we supply or the procedures we outline is that we can't possibly guarantee performance or safety. We recommend the use of wire with a known insulation voltage breakdown rating, particularly for high voltage wiring. 600VDC is a good starting point for that use and that is what we supply. The high voltage wiring in the Kaiju uses 600V rated Teflon insulation. I don't recommend using a covered wire that has no insulation breakdown rating for those connections.