Hello Mike , thank you for your comment.I agree with you. Concerning the tyres, i think to it while the workbench, but it was too late the wheels were assembled to the frame, i couldn’t replace them anymore (Snap tite assembly), that’s sure it is not the most realistic tyres. Concerning the engine, according to me , if you begin to do, even a light weathering , you have to do the same thing to all parts of the model. If the color engine was red (for example), it will be less lightning,but you’re right the next time, i will use dark grey primer before white painting .???