Hello Gary,
I had Ted Frye at Raptor archery cut a one piece Morrison Cougar in two pieces for me. Ted used the Warren Bow Bolt system, at my request and did a fine job. I would recommend Ted's workmanship to anyone.
I also sent a Black Widow LAG back to the boys at Black Widow. They installed the Talon system, which has one "U" shaped component. Black Widow folks did a nice job on this retrofit also.
There are several techniques out there for the lock-up devices, suggest you first decide what type of lock-up device, then find the craftsman to do the work.
The shape of your longbow riser handle will play a part in the hardware selection process.
Good Luck with your project.