Surely the mechanicum would have mitred corners??
Not necessary, each corner has a octagon shaped pilbox so I need only cut off the excess once the glue has dried. Incidentally and thanks for reminding me I need to make these rhombus shape structures removable to prevent damage when the Titan is disassembled.
And an interior shot of the Emperor Titan War Room
Incidentally this is an excellent video showing an Emperor Titan in motion:
"It is easier to deceive people than it is to convince them that they have been deceived."