I have a Small CNC, and access to a large one at work. Your ribs would be a trivial challenge for any CNC router. A minimum of a 3-axis CNC would be able to cut your 2D project. You have X and Y coordinates to plot the outline, but you need the Z axis (up and down) to step down into the wood. Several ribs could be cut in one session from the same sheet of birch plywood. Every rib would be cut perfect and the same (assuming they were drawn perfect), or each one could be different if they needed unique holes or slots or pockets. You would need to provide the pattern(s) as a digital file, and most CNC shops can use DWG, PDF, DXF, AI, and a few other vector (line) formats. Depending on where you live there may be a local shop or two that could CNC cut the parts for you.