After printing the linework I removed the border and other lines that weren't needed for the finished black print. They were printed to be used on the colour blocks. The Kento marks were also printed in order to transfer the same registration from the key block to the colour blocks. I used this print to draw up all the colour blocks.
The 3 colours I'm using are: Alizarin Crimson, Yellow Ochre and Phthalo Blue. I'm using the blue in 2 strengths, one as a kind of "grey block" to create simple shading and secondary colours and a stronger mix for the sky, domes and doors.