Here's Mark II.
This builds on the original design with also trying to tie in the business more. I'm not a very traditionalist thus I've made the bottom panels one with the top panels and removing the dents/lines.
This isn't a signage design more than it's about panel work. The shape around the lettering (logo) would actually be cut out of the original body and indented (by as little as 2cm) and any dark colour would work, black, grey etc. For further effect, 'damaged' or given a rough surface - a molten metal look is what I'm thinking. The lettering all cut out of metal and chromed. Again a raise from the flat surface of as little as 2cm would work really well.
To tie everything together, the edge of the cut-out shape would look great surrounded in the same way the windowless panel edging on panel vans but smaller (approx half the width) and with sharp edges. This will show of the obvious skills on offer and brings the usual Commer-van-ness to the design so to not alienate purists.
For extra super bonus points, make the edges (as shown on the purple bit) extend beyond slightly from the original panels and curved on an arch so the centre is level with the original panels to give it a truly 3D perspective.
Again, metallic or pearl finish. Any colour with zip will work. White on top. The rear would just have the logo and contact details sign written. The front grill and bumper(s) would be great if custom made. Not something crazy, just slightly different (ie smaller than original etc) and chromed. Again shows off the skilled service without alienation.
Some work by a good airbrush artist would be great. Darken the inner edges of the logo cut-out and accentuate the shape of the van in the purple areas. This would make the design pop more but also sells Commer's to the uninitiated. More Commers on the road, better for business.
Leon & Tia 'Commy the Commer'