Yes, I believe it is the preferred way to install a cowling. It provides a stiffer edge to the top and lower cowling pieces; Is easier to install and offers less opportunity for fiberglass cracking as the load is uniformily distributed to the entire cowling structure instead of concentrated at the conection points.  I installed the hinges on the lower cowling on the firewall edge as well around a portion of the lower radius to within about 6-10 inches of the lower cowling air exit which is secured by two blind nuts and screws. the cowling installs quickly and retains its shape.

Bob Smiley
N94RJ