While googling about on the esters in wheat beer, I came across this interesting presentation on wheat beer fermentation from the Master Brewers Assoc of America, www.mbaa.com/districts/MidSouth/Events/Documents/2010-03-13Wheat_Beer_Yeast__Fermentation2.pdf (http://www.mbaa.com/districts/MidSouth/Events/Documents/2010-03-13Wheat_Beer_Yeast__Fermentation2.pdf), highly informative, particularly keen to try a (somewhat!) open ferment which is it says helps increase ester production, I think a loose lid will suffice.
All the other Mid-South district files are below...
www.mbaa.com/districts/MidSouth/mash/Pages/Presentations-Archive.aspx (http://www.mbaa.com/districts/MidSouth/mash/Pages/Presentations-Archive.aspx)
...some of the other Districts also have presentation archives, it'll be located under 'The Mash' on the left-hand menu of the particular district
http://www.mbaa.com/districts/Pages/default.aspx
Happy reading!
Edit: With the mention of not only an open ferment but also a shallow depth ferment, I twigged I could use a 35l storage box which I picked up in a eurosaver shop, perfect dimensions. Just have to secure the wheels to stop it rolling off the brew table!