Today I made a long carrier base. It holds up to 34" long boards. It may be the most useful size for users who just want to carve one side of a variety of board sizes. I have a slightly different idea for using it. It is not too heavy but it is long. I was thinking that if one always put the board in the middle, it could be kept balanced. To this end I think I will make a few touch holes along the length. One would have to jog to the nearest touch hole. (If one wants to measure the board width that is. If one uses the carrier width, no touch hole is needed.) I have yet to experiment with it.
Here are some pictures of the different sizes.