I looked at the urls you provided. It looks like it could be easily done with a conventional mill as Chris65 said. To locate your holes for the buttons etc you could always build a jig and get very good tolerances. With a well thought out jig, also built using the mill, you could place your work under it using locating pins, clamp it all down and then have a pattern to easily repeat your holes. Several companies online supply hardened bushings with various ODs/IDs that would help guide your drills and by using the index dial on the knee you set the depth of cut for endmills that can be guided to the extents of your recesses for a flat floor. This should make the process much faster.
Best of luck
Scott