<t>Thanks Puybaret. Your second tip is what I needed. Create the room first then double click inside with the wall creation tool selected to automatically generate the walls. Guess I should have read all of the manual first.<br/>
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Still, I now have my rooms with the exact internal dimensions ...

<t>...just had to let you know. Well done everyone who has contributed to its development [:D] <br/>
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One enhancement (and this already may be possible but I can't see how to do it). Is there a way to 'fix' the internal dimensions so that when you draw the walls the lengths don't get adjusted ...