I ended up picking it up but it's in pretty bad shape. figured I'd rescue it from further harm.
the frame is solid, but the desk had been stored in a damp location and the melamine coated particle board has swollen a lot. gonna see if I can get replacement melamine from Home Depot and rebuild the desktop pieces. The desktop pieces are not interchangeable like I thought -- they are held to the frame with crappy hinges so they can adjust up and down, but they don't move around. I don't know if the hinges are original though, but they are needed for the desktop to be held in place. anyway, it needs lots of work and will be a fun project for sure. a little polyurethane goes a long way!