I think you will have difficultly getting this done with a 5-axis machine since I don't think anyone on the forum besides myself have ever had 5-axis on their machine.

However perhaps the design could be adjusted to be able to be cut with just 3-axis? The 50mm part could be 'sliced' into (for instance) about eight sheets of 6mm plywood and the holes which would be elliptical cut with 3-axis. Put reference holes in the corners for pins/dowels/something to align them then glue them all together. Clearly this would result in a stepped finish, but if that's sufficent it would be a cheap method. You might even get away with two sheets of 6mm plywood with a void in between which would save a lot of cutting.