I tried searching Google with various search hits but came up empty. Am building the 1/72 Airfix model and the interior behind the two doors on the rear where the hose is stored is so poor that I'd like to drill it out and scratch build something more appropriate.

This is my current progress.

the fact is that the pictures of the "opened back" are rare...
I've only three of them :
http://i68.servimg.com/u/f68/16/35/94/66/bdmwc110.jpg
http://www.servimg.com/view/16359466/562
http://i68.servimg.com/u/f68/16/35/94/66/snymek10.jpg
I don't remember where I got them, but certainly on the Mapple leaf forum a long time ago...
I hope it will help you...
Pascal

At least you can find these pics in this restoration blog :

http://hmvf.co.uk/forumvb/showthread.php?15406-Bedford-MWC-66144-water-tank

H.P.

Thank you Pascal and Henry-Pierre. Yea I figured some of the 1:1 vehicle owners might have some but it seems we will have to dig a little harder before I can fill up my WW2 RAF aircraft with glycol.