Thanks everyone. Wayne, good advice indeed. Never thought of sanding the whole model but might do so if I coninue woth acrylics. I actually had intended to keep the white precoat and mask off the tip of the nose and fin for the rest of the paint job. Not sure why I didn't follow through on that plan.
So now the wheels have gone on and the next step is to complete the hydraulics for the brake lines and actuator cylinders over the next couple of days. Then it's painting and attaching the bombs, adding the fiddly bits, and finishing the Kettenkrad.