You need to fix the plate to the surface to datum lines with clamps or double sided tape, and you need clearance for the router base of course, [ not always possible, that's when you decline the work!].
Sometimes even if there is room....
Alan other than that, hows the tractor?
I also agree that a roto-zip does take some getting used to, but once you do, it becomes a tool of choice. With a sharp wood bit, and a steady hand you can cut a wide variety of things... If I remember correctly - the guy who started the brand (now owned by bosch) was an electrician? Who modified laminate router bits to dive cut wood, and essentially repurposed routers. Basically put what he saw rockers do to new uses - and branded a name....
All the ideas on templates are great, but I'm gonna stick with paper, or pdf that I can leave on my site. As I have found out before, if I hand off the template, I'm never going to see it again.
