Mark IV British WW1 Tank

This is the model of a British Mark IV Tank (with some details from a Mark V) from World War 1.
There are some parts missing, like the unditching bar and its rails, for simplified printability. I left out the gun barrels too, to add them later with some material from the workshop.
I separated the Tank into four parts. I don´t like the quality from my supportmaterial connected faces, so i tried to avoid support. For that reason, i cut the hull in half and turned the lower hull upside down.