I haven't ploughed through all of this thread,so I might have missed some stuff.You can use a normal router to spin the cutters,but be aware that it needs a bit of care.The plates for the support can be almost anything that is stiff enough and if it isn't initially stiff enough you can always bolt a piece of steel angle to it.Far too many first timers seem to want a copy of a machine they have seen promoted by the originator as a wonderful thing,which it may be compared to marking out a sheet with a pencil and cutting it out with a jigsaw.What it never seems to be is remotely comparable with an entry level professional machine.

How about posting a CAD model or even a decent sketch of your design for a critique?There are enough experienced eyes here to spot any defect if you are mature enough to accept the comments and not inclined to fly off into the territory of "yes but....." and plough on with the original and it's shortcomings.