Ahh yes I see, and you find the single clamp to be sufficient? I am wondering if I would be able to use the same system but with the clamps on the inside of the unit (obviously I would need to make a cut out in the top to allow passage past the clamp when being flipped).
R.e the drawer, I am thinking that I could use a false front like you have and then use the space to store a length of 50mm ducting and associated bits which I use when using the machine - they wouldn't care about being turned upside down or jiggle about too much.