Aluminum cuts about the same as wood. If you are going to be using veneers then you have a 90 deg V cutter. Just get a piece of square aluminum and make your own. Piece of cake really. I cut my veneers on a taper so if I was inclined to make one of these I would make it on a taper also so that when I put my veneer stacks in they could be even with the outer edge of the jig so that the rubber bands or what ever that is used will hold them in contact but won't force the veneer stacks over any.
Dick