ive put a wooden board down at the back of my tank and covered it in the same black plastic sheeting.its fine as it is.i then screwed my reel to it on one side and i have my pumpbox on the other.
nice and simple set up adam. 
so have you sacked off the carpet cleaning and pressure washing and mainly concentrating on the window cleaning mate?
Not totally sacked it off and there is still space to fit the gear on as and when I need it. But at the moment I'm not pushing it and just trying to buid the windows.
I don't want all the gear on there like before, just want a minimum of gear to do the job and the rest of my stuff can stay in the shed to be used when needed.
I'm finding it much more enjoyable to just do windows without the hassle of humping stuff in and out.