Checked out your photo's and they look great... My Van is a VW T5, so is much smaller than yours, although I have 19 tough boxes in total in the Van..
The boxes are fairly close to each other, although you can easily lift the side handles to release them. The van is pretty tight on space from the back doors to the bulkhead, so everything is measured to the last MM..
Thats why I have the trestles hanging just inside the curves of the back door, and have my 2.6m Rails (2off) slotted above the Boxes in the Birch Ply channel on the RHS of the Van.
On the LHS there are 3 wooden shelves (screwed to 25mm box section rack) to hold tools and miscellaneous. These too are built in Birch Ply, Dovetailed on the edges and lacquered..
I will post up some more pics at some time, although I believe that Dano-uk has posted you some..
My set up means that I can unload the van, including racking in under 10mins to have a completely empty shell..