To TigerII:
Hi and thank you :-) decals are stock from kit. I didnt use any special technics, just normal way. I close hatch, then decals were applied and after 10 min a cut it with knife. then more softer has been applied, let it dry and repeat the process if needed again and again. But what is important in my opinion is to use oils to make it dirty same like other way. If I let it be white it will be too much contrast. (sorry for my english) :-)
To JBark:
Roof and side or turret is in one piece, but Iam sure you can glue it together and just put the roof out. If Iam right thee is kit from takom Tiger 2 and there are two pieces, turret sides and turret roof. this Panther kit have the turret roof and sides in one piece.