I finished up the radiator assembly today, and installed it into the fuselage. Now, with that ready, I was able to close up the two halves. With minimal fuss, everything lined up perfectly (pretty much expected from this kit).
In the radiator exhaust area, there were a couple of ejector pin marks which needed to be filled and sanded as these would be visible on the finished model.
Some of the sub assemblies in the radiator area use sandwiches of plastic parts, PE inserts, and small linkages with metal pins. They look a bit complicated in the manual, but if you take your time they go together with minimal fuss. I annealed the PE parts before attempting to bend them to fit the slightly curved plastic bits, and this helped them to conform. I also gave them a good sanding to roughen up the surface to better accept the Alclad paint. In the end, they look like one piece.
I also masked and painted the armored glass in front of the gunsight. This was a bit tedious, and I wish Tamiya had provided a mask for it on their printed masking sheet. The framework is very delicate, and masking entailed thin strips of Tamiya tape and punched out disks of tape for the radius ed corners. I also tried something different with the gunsight, instead of simply painting it it's final metallic black finish, I first cleaned it up and then masked off the lens. I then gave it a coat of Alclad aluminum, and then the black. This was followed up with a drybrushing of silver and raw umber, and then the lens mask was removed. Done this way, if you look down through the lens it looks like a metallic box with reflective properties inside. I think it turned out well, though the effect is difficult to capture with the camera.