Here is an update.
I got the machining on the rib done for the sights and scope mounts.

I decided to go with a simple dovetail setup for talley rings with the express sight acting as the recoil lug for the front scope mount. The rings drop down and slide forward and tighten with a quarter turn of the QD levers. The rear ring mounts right at the back of the rib and the existing rib extension on the barrels was thinned down enough to allow for the rear rings to drop down over it.
I did some ball mill cuts on the section of the rib in front of the express sight in order to style it some and match it to what I did on the front ramp.
I machined the front ramp with a 5mm dovetail for accepting a european style (push in from the front) sight.