Hello Mike ,
I think it would be 50 centimeters
Now let's go, the first cut has something ...
The construction of the castle is divided into different colored blocks. The part numbers are printed in the respective color.
The individual blocks are then summarized on the arches. We start with the upper castle, marked in yellow.
Object 1 is the third gate in the entrance palace, very well drawn in the building plan
Start with part 211, a door ... which belongs in the passage
Yours sincerely
Kurt