Having made about 6-8 TC chassis over the years I suggest using a router with a copying bit. It leaves a very good edge and although people said that I would need to replace the bit very often, I'm still on my first one! The down side is that you need something to copy. For what I was doing it was perfect as I could copy most of the chassis and when I did the cell slots(or the bits I wanted to change) move the chassis forward and then copy the slots in the new position.
It depends on what you are doing but it might help.
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