I've been looking for another manufacturer as well, no such luck here. Some metalworking tables that are similar but make the Barth look cheap.
Bit of a project to put one together, but it's a fun idea. Might have to start working on a design, make it the first big project once I finally purchase a full size CNC router. Upgrading my shop and making room for either a 4x8 or 5x10' CNC table and related accoutrements is on the list, but there's two remodels and a screen porch I have to get done for family before I can work on my own stuff, lol.
Have you seen the RPG-V model? It combines the regular table with a flip up vacuum press. No clue on what they want for that one, lol. Not like the regular multi is cheap, starts at $8,000 or so, keeps going up and up as you add more clamps and accessories. I can't remember where I saw the figure, but the rack, cart and all the extra clamps shown in the video have a grand total somewhere north of $30,000.