Enjoying this build with great interest, Thierry, as the Battle of Britain Mk. 1 spitfire is my favourite version. You probably know, but Fundekals do a sheet for the particular aircraft ( DW . K or DW ; Q ). I'm not sure of the scale, but you can download the instruction sheets from their website, and they have excellent info on the roundels, lettering and camouflage, which you might find of interest. HTH.