Got it all assembled in the gun and tried a 5 shot group.

Observations are...

First stage is a little sticky at times, new trigger needs slightly slimming down (final polish will achieve this).

Cant set the second stage as short as i'd like as the sears have slightly rounded edges. Set it too short and the piston rod wont reliably catch. I need to stone all the sears to have crisper edges to be able to set a shorter second stage.

But, set up so its not ideal, but is safe to use and without any practice my 5 shot group has shrunk by about 1/3 without really trying as let off is already more predictable than before.