TBHs are not necessarily trapezoidal, many are rectangular and some of them 
are built to Lang dimensions.


Look at Robin Dartington's Long Deep Hive.  This is what Wikipaedia has to say: 

Dartington Long Deep hives
The Dartington Long Deep (DLD) hive takes 14 x 12 inch and can take up to 17 frames. It is possible to have 2 colonies in the brood box as there is an entrance at either end. It has half size honey supers which take 6 frames can be used which are lighter than full supers and are therefore easier to lift.[18] The Dartington originally developed by Robin Dartington so that he could keep bees on his London rooftop.

Chris

 

             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html

Guidelines for posting to BEE-L can be found at:
http://honeybeeworld.com/bee-l/guidelines.htm