You may recall a little while back there was a discussion about display cases for our lovely little cars. Well at the time I sourced an acrylic case made specifically for the Mini-4wd's from Ali, it was as you'd expect flat packed, assembled fairly easy and looked reasonably ok. However coming in at around £25 delivered was quite a pricey solution just for displaying 6 cars.
So, I've still been looking and have found a possible alternative that is far more cost effective and actually is better in many ways. It is available on Amazon.co.uk and is designed originally to be used by cafe's etc... to display pastries etc... It has 3 shelves, plus the bottom of the cabinet so effectively 4 shelves. Each of these is big enough to house 3 Mini-4wd side by side facing forwards, and quite possibly 4 per shelf if placed side on and 2 deep. Of course in this configuration you may need something to lift up the two rear ones a bit so they are viewed better, but I've not decided yet. It also has a door with a handle which is held closed by miniature magnets. This cabinet cost me around the same as the one from Ali.
I've also enhanced it by adding some lighting, this is in the form of miniature LED lights which are contained in little chromed steel tubes. They are twisted to turn them on and off. To secure them in place I've glued some small Neodymium magnets to the top of the shelves (and top plate) and the magnets hold the lights in place below the shelf. This allows you to get them out easily to turn them on and off or if needed replace the batteries. This works very well and illuminates my beloved cars very nicely as you can see in the pictures attached.
Hope this gives you all some ideas...