We sliced up a sheet of 18mm Plywood we had in our stack of sheet wood, it is rather dirty and got loads of screws holes but we thought we could use it and varnish it with Ebony black to hide most of the marks! we then routed a smooth rounded edge and drilled pilot holes and countersunk them ready for screwing up.
We needed to do this now as our new sheet rack is so large that it will block the utility rail completely.
The concept of the utility rail seems to be looking reasonable so far and when we have painted them black as well it might work rather nicely. We will see.