hey Mr. Folk,
the 315 number board is something we will do in the future for sure. it's gonna require new cad drawings for laser cutting the ring and the smaller numbers. being that the 315 never had a rectangular number board, it wouldn't be quite prototypical to make one in the current format. i am looking forward to it though, for the round will be much easier than the rectangular!
jeff,
the numbers are 5" tall currently. with cad, we could enlarge or shrink them to virtually any size. unless the demand was big, it would not really be worth it, as we must meet a minimum order for the laser cutters. if we ever get the dimension for the standard gauge board, we could potentially cut slightly smaller numbers, and do the standard gauge "4 number" boards.