You might want to look at a more dedicated machine. A CNC router will be at least $4K for 24 X 36 machine bed. The software can be another $1K to $10K depending on what you want. A longer machine will allow for less indexing, you mentioned 100's of pieces. Look for used machines or maybe contract with a local cabinet shop?
Look at setting up both sides in one fixture, maybe 2 or more sets to save set up time.
The beefier the machine the faster you will be able to cut, up to the cutters limit. You will need to make sure the distance from the cutter to the table is big enough and that Z travel is long enough. It looks the jcut-6090a may be a little short there. Some machines it is a simple matter to raise the router gantry others are a lot harder.
The Z travel is perpendicular to the table. Machines designed for engraving will most likely not have a lot of Z travel.
From what I've heard, those Chinese machines on Ebay are mechanically decent, but often have garbage electronics that may need replacing. By replacing electonics, you can greatly increase the performance, and it's still a very good price.
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