Probably won't bother with a Pilz then at least for now. I could make it so the limits / home are sideways on. I'm still a fair way off sussing out how to position the other axis switches but i do have options. I'm new to this lark and my preconceptions and concerns about damage have been more focused on the machine frame / bearings and ball screws etc as this would be more catastrophic and expensive. I really appreciate advice based on actual experience and I'm in no doubt that i haven't done enough research to get things right first time. Which ever way my machine turns out i'l certainly be keeping an eye on it especially when I'm cutting stuff that goes near the edges of the bed.