Get creative bro! As long as it doesn't touch the a-arms your golden, I used a thin cardboard box for a year before I started using PVC tubes!
I put 2 LED light bars in mine in between the 1/2 PVC tube rails one facing up towards the machine and one facing down (they're scale rock crawler light bars), then a simple tray underneath to catch any fallen screws/bolts. On the bottom of the tray fasten a high powered magnet to it just incase you bump it you'll be less likely to lose any hardware
For my tray I found an old square plastic basin, and cut holes for the PVC legs o stick out
I got the idea of using LED light bars from watching the killer-rc videos, then I thought why do I need to mount them on something moving 45-50 mph, when I can mount then on my stand!