If you compare your Rizzini DR action to the Perazzi, I think you'll find that they are vastly different in design.
I'm not suggesting there is anything wrong with the Rizzini, just that it is a different action design compared to the Perazzi.

Perazzi incorporates many strengthening features in their O/U actions compared to other Italian makers.
The Perazzi DR action shown in the link is a very good design indeed for handling rifle cartridge pressures.

It features very thick bolstered sidewalls, the hinge trunnions are supported by the knuckle, axial load on firing is taken mainly by the (large) lump radius, barrel bites are integral to the monobloc, and are positioned nice and high, and locking bolts are located deep within the action frame.

That's one hell of a strong design.
I think this Perazzi O/U has the potential to be a great double rifle.
It would be nice to see the addition of vented and bushed strikers just to top things off IMO.

I like the looks of it and can't wait to see more photos and details.