Nice Updates. The Side Mirrors are looking cool, they match the classic body shape of the 70s. Good to see the locking placement of the soft roof. My brother had a soft top Mustang convertible 2002. It used a similar mechanism to lock up the soft top, from the inside, with turning hinges, one at inside right corner and one at inside left corner side of the roof.
Also, make sure to place a rubber seal ( similar to those around the doors), at the top where the top of the windscreen meets the soft top, it will ensure the outside noise is minimum and more importantly, the water does not seep in from the top front of the windscreen.