The Glass has a flat tape style gasket that wraps around the edge of the glass. The door itself uses a round or rope style gasket.
There is no gasket between the cast iron frame and the panel in the lower door assembly.
I too was less than thrilled with the seal between the glass and the brass door frame so I used some high temp black RTV which worked very well.
You may have some trouble with removing the bolts that hold the frame to the door, mine were fairly well corroded. I replace them with SS and used neverseeze on the threads. A good penetrating oil like PB-Blaster helps loosten up the corrosion and can prevent twisting the head off a bolt.
Hope this helps