Here is a side body shot of the WGP V1 auto nelson kit built for a Ranger or Line SI Bushmaster. This is not the more standard V2 Auto Trracer kit.
One a ranger or Later Line SI Bushmaster this kit would be dealing with a beefier powertube. Both the WGP Ranger tubes and later line SI tubes used 10×32 cup seal threads and the base was much thicker because of this.
On a Line SI Bushmaster your still going to be wearing out your Aluminum body and cocking rod slot but on a Ranger you have a stainless body so it might actually have been a working combination.
Maybe a Line SI bushmaster with some varied Lapco hammer and spring combos might have been nice also.
Here is an article I put together on these kits vs the later Auto Trracer kits.