MHO. The early 911 chassis were not particularly rigid compared to the latest versions, even compared to some mundane late model sedans. Therefore, anything one can do to add rigidity to the basic structure is a plus for handling. Try this. Park the car so the front end straddles a steep driveway at an angle with the rear end on a relatively level surface (basically putting more load on one corner). See if the front doors open and close easily.
Here's our version of a triangulated strut bar using a single strut bar WM as a basis.
Sherwood
www.seinesystems.com