C&L wouldn't be any good for OO unfortunately, TBH you need a bare minimum of 1mm flangeway gap.
If you wanted to have a go yourself with C&L parts, copperclad might be the way to go as I assume it will be buried under the road anyway?
You can buy pre built common crossings and pre-filied switch blades, to take the pain out of building your own, from C&L
Above all, which ever route you go, have fun!