HI Ajcmac, I built this one myself a little while ago and the only real problem I had was those $%^ ejection pin marks everywhere and watch the decals. Mine shattered when I wet them and I ended up painting a lot of the large markings. I have attached the link to my build for you as it is under a different model to start with. http://www.ww2aircraft.net/forum/your-completed-kits/switchas-lancaster-pics-14181-4.html
Your 109 is looking very good and I love the cockpit.