I know its not a late bay conversion but a friend of mine sent me a link to this site and I thought I'd share it. Quite a novel idea I thought, maybe you could convert a bay to have a slide out double bed section! Nick http://www.doubleback.co.uk/
Saw this a little while ago and then saw it 'in the flesh' at VolksWorld on Sunday. Looked really good in general and the quality was good. But it can only carry 3 people at the moment, which is not an issue if there are 3 of you, but if you're looking at a design like this then there are probably a few children in tow.
YOU can also get a glass roof as an option on the expansion pod so you can sleep under the stars ... sweet