I really appreciate the tour of your work. Very nicely done.
This is not technically an outside lock airgun, or at lest it is not what an outside lock mechanism is as seen in Wolff. Instead, it is a modern direct-trip battery; the hammer never goes past the intermediate member,
so, it belongs in the category of a direct trip battery.
It is very similar in form to the late British ball reservoir direct-trip pneumatics. Some of the finish airguns ever made are of this type.
Your implementation is unique in that it has an outside lever for the hammer to work against.