you will be more likely to dig an edge into copper as well because of its softness. go with steel. like bam bam said any metal scrapyard will have something suitable for a rail if you walk around for a half hour tops. and try to just go for a flat rail, they are a lot easier to attatch compared to two round rails. flat rails all you need to do is drill a small hole for the shaft of a screw, then a larger hole about halfway through the steel so the head is flush with the metal or deeper. then fill in any voids with this stuff called JB Weld. its a two part epoxy that is desgined for repairing cracks in motors and stuff, you can get it at any home depot or lowe's. its fuckin hard and fast and you wont dig an edge into it, not a chance. thas what i did and the only cost were the screws, and the JB Weld. i got the metal from a scrapyard and the wood from a dumpster by a housing development that was going up a few miles away. just be resourcefull and dont use copper if you can.
'WHY aren't you having anything to drink!? Choooose one making you better feeling!'
'Is Mike Nick and Mike Wilson the same people?'
-Member of the OTC-