Mike -
-- The ROPS appear to be almost 3/16 wall tube so I simply drilled & tapped four 1/4 - 20 holes, added a dab of locktight for added piece of mind & bolted the lights directly to the tube. The weld seam of the tube just happened to be right in the center where I drilled & tapped so there really wasn't an issue with having enough thickness for the tapping. -- As for power, I did come directly off the battery & installed a 30 amp fuse in line to handle the lights & power outlet. I split the line after the fuse running constant power to the outlet & switched power to the lights. -- I decided to only install one switch for all four lights. You certainly could switch them separately if you chose to. It's just a matter of installing one more switch & pulling one more wire. My thought was - when I work in the dark, I always need to be able to see in both directions - to go forward, to back up & / or keep an eye on the implement behind me. The only exception I can think of for that logic is if you have a backhoe & would only be working from the rear. If I am just transporting / traveling I can still just use the factory front lights if I want. -- As for running the wires I chose to run all my wire in flexible plastic conduit (available in most good automotive or electrical departments). That way it has a little extra protection & matches the factory wiring perfectly. (look at the wires running to the rear flashers / signal lights) I ran the wire outside the ROPS in the flexible conduit for three reasons. 1) There appeared to be a real pinch hazard for the wires with the extra slack needed to fold & unfold the ROPS if your not paying attention to what your doing. 2) Ease of maintenance in the future if the wires decide to go bad at the folding point after a few years (which is probably fairly likely after a lot years of bending) or if your needs change & you want to add or delete wires. 3) Being in the conduit on the outside alows for minimal slack in the wires while still allowing & forcing the wires to make a more gradual bend at the fold point. I know thats a long answer but... Hope it helps.
Good luck with your new machine. You'll like it.
Troy