I have make a back plate the I paint back and silver and gloe elements on it after painting it. Its gives a great 3D effect. I sell it in my shop for EUR 15.
I cut the back panel and the elements so I can colour everything afterwards I the right colour.
After cutting I paint the back panel in black on the downside and grey-silver at the top. I use spray paint. Then I colour the old truck parts brown and use another colour for the rest parts.
I glue everything together using superglue and put a cord so you can hang this board on the wall. It's very simple to make, people love it in my shop.