I have a table that looks just like that. Below is a picture of the table, upside down, so I can clean and align the linear bearings to the gantry. It was disassembled when I got it, so I took my time with reassembly.
It is indeed 5 pieces of extruded aluminum, with steel bars connecting them together. I never took the table apart, didn't want to deal with all the bolts. I also had a trailer to haul it on though. In one piece, my table alone weighs something like 150 lbs. It's a two man job to move it.