It looks good so far. I would suggest getting the entire thing smooth, and then go back and cut the detail in it. Build up the Bondo, and use the electric sander to smooth it down, and then use the dremel to get the smaller details. Then there might be some small holes, just use Bondo glazing and spot putty to fill them in. It doesn't require any mixing, just squeeze it out of the tube, and fill a hole, and go a little over, so it can be sanded down. It is a little bit softer than Bondo, so it should be lightly sanded by hand, and then it should be ready for primer. You may have to go back and fill in some other holes, or you can keep it a little rough, and make it look like battle damage.