Yes, this will work with the Ryobi P601.
The steel frame is equipped with adjustable cams that allow for 1-3/4” and 1-3/8” door settings. The cams can be removed, however, manual measuring will be required.
Yes, according to the instructions that came with it. I only used it on the doors as I was replacing all of the doors in the house and I matched the hinge location on the doors with the existing hinge locations on the jams.
I doubt it. It needs a wide base on the router so that the router is supported by at least 2 sides of the template at all times.
Yes, you use the template with the 90 degree corners and the router bit will make a 1/4" radius as it cuts out the pocket.
Read the direction
yes you just reverse the template to get 1/4 or 5/8