Looks very neat trippy.
Where did you get the little grey boxes that u put on sides.
Also where you get bits for the pole holders ive been thinking how can i do sumthing like that i see they are bars,simular to wardrobes, how did u get the bits to go up to section the bar off and did you cladd the bar with sumthing?.
Top job though well done. 
We got the bars at B&Q, your right they are the wardrobe bars, you can buy the brackets there too.
As regards the spacers, i just bought 75mm angle brackets,taped them on with leccy tape,then cut pipe insulation to fit around the brackets.
Then just to brighten things up a lil,i wrapped blue leccy tape all over.
On my last Dispatch,the mk 1, Frank kindly let me have bars that he had on his old van,he had them especially made. But the newer Dispatch is wider,so these wont fit my new van (nor the bloody roof bars)
The plastic boxes were bought at my local discount store £1.99 each, i simply screwed them to the ply linning,and used a penny washer also.
There are two of us mate, so 90% of the time one of us can see the van,i used to get the hosereel in and out all the time,but found it tiring,and also the reel kept falling over,so the reel is now fixed in the back,and if you look at the pic again, you will see that the hose goes through one of those hose thingy bobs,with 4 runners, makes it dead easy to reel in and out almost without effort, B&Q do these at about a fiver