It looks like you still have the gap at the front hull. When I assembled mine, I had to chip away the gray primer and even had to file away some metal to make the gap disappear.
While I did not apply any zimmerit, I thought mine turned out fairly decent. You're going to have a tough time putting those tracks on if you add the skirts first. The tracks fit extremely tight and I had a hard time getting the side skirts on after I added the tracks.
Not many of the Dragon kits come with diecast hulls. As far as I know, only the SturmTiger, AAV7A1, Panthers and maybe one or two others. The boxes are clearly marked and the box has a little more heft to it.
Here is a link to my kit:
Panther Ausf. G Early.