You can build a larger MFT, many others have posted how they did so on FOG. I recall that Jerry Work wrote about his build. But he later decided to disassemble it. I think he found that he preferred moving a collection of MFT 1080s into whatever configuration he needed for the project at hand. Jerry still participates on FOG. He could provide you much better information than I can.
If you are looking for capability of working with large projects, I recommend you look into the latest issue of Fine Woodworking. In it is described a novel, simple and inexpensive to build, modular work table system based on two relatively low shopmade saw horses with flat tops about 1 1/2 ft wide onto to which one or both of a pair of long torsion boxes can be supported. The torsion boxes have different materials on different surfaces so you can have a hard surface, e.g melamine for absolutely flat glueups without concern about glue sticking to the surface, or a soft surface that will grip a board sufficiently to rout it without clamping. Because the torsion boxes are each about 2 ft wide, 1 ft thick and 8 ft long, you can handle short, long, wide or narrow workpieces. You can clamp one of the torsion boxes on its side on top of the horses, then clamp a long board or door to the side of that torsion box to plane or mortice the edge.
I have 3 old style MFTs and prefer to be able to move them around as needed.
Dave R.
