Eric:
I echo the sentiments of others on those bitty cupola hooks: BUMMER
More so, maybe, as the same thing happened to me during my trevails with a Heller Renault R35. So it's genuine empathy!
The suggested fix works - I did something similar, at least as simple, and a little bit more "instantly gratifying":
Take the scrap bit (I used 0.030 styrene to get the right thickness plus.) and drill it, and then stick it onto a piece of blue tape (I use blue painter's tape - the blue makes seeing almost all colors of styrene easy), and carve your bit to the desired shape. Once shaped, pull it off and do a little sanding or scraping to round off the edges as desired.
Cheers!
PS: Those little cupolas usually had a pop-up center piece that served as a top vent on the turret. Looks like you have sanded this off?
Bob