I make no apologies for the use of Imperial dimensions... The equipment was designed using Imperial timber dimensions and the limits and fits were sorted out accordingly. Metrication is not just a process of translating or converting values and to metricate this design would require knowledge of the original designer's calculations (which are not to hand).
I have spent much time working on this project... The drawing at right, alone took about 20 hours preparation, during that time I have come to respect the design a great deal and am a little confused as to why it has fallen out of favour. Especially when there are a number of WBC hives still in use... If the CDB and WBC are compared, all features favour the CDB bee hive and by a very large margin.