.

I'm not sure I see a need for the side profiles to be continuous.

Years ago I had a setup somewhat like your idea, but I used MFT corners and 4 of the long profiles to create a center table that connected between two stock MFT 1080s using MFT table connecters. This allowed me to mount a FS 1400/2 guide rail across the width, or a FS 3000/2 across the length with the stock guide rail brackets. But, this really proved less useful than just using a simple cutting table along with a pair of conjoined MFTs with a FS 1900/2 rail mounted. Two problems with such large tables are 1) your arms are only so long, and 2) positioning large/heavy sheets up against stops is less than ideal.

My recommendation is to use one or two MFTs for smaller to midsize workpieces. For cutting down full size sheet goods, use a simple cutting table (or just a sheet of pink foam) and an aftermarket set of parallel guides and a rail square like the TSO Guide Rail Square.
 
This looks to be a configuration that you intend to remain in position rather than fold up. If that's the case, know that the MFTs' rubber feet will deform after a time -- especially the adjustable feet. It would be far better to have adjustable feet -- and much better feet -- at each leg, not just the one per table.

I think that you would be much better off making your own base that is more of a single unit than starting from multiple MFTs. That way you eliminate any alignment and leveling issues that you would have otherwise. Search for jumbo MFTs here for plenty of good examples.

 
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