Thanks Chris, Bud and Lindsay for your kind comments.
Lindsay - Using the 1:32 scale plans I have, I cut out the section involving the cockpit, I then remove the centre section (the hole) from the plan using a sharp scalpel blade, this is then placed on the sheet of plastic and marked with a fine tip marker. I cut the 'holes' using a very sharp scalpel blade (No.22) following the drawn line, this cutting is done free hand, one pass will do a good clean cut as the material is only 0.25mm thick. I think the main ingredient here would be a keen eye and steady hand.
Because of the small size of the Mercedes symbol I was going to forget about it, but after a little bit of experimenting I realised it was not that difficult to make, I'm glad I did go to the little bit of extra effort.
Des.