It's all progress Dan..

Howsabout a quick vid of it in use and some specs ?
The barrel looks shortish - 11" ? An option for 14-16" will give more efficiency.
Also when you talk about reducing the action length.... maybe also consider using the space saving for more spring room instead (helps with spring longevity and stress) as it doesn't look too long at present ?

Continued good luck on this mission !