Seems to me, that there was a very distinct difference between the engraver models and the router models.... In fact, I know there was. The engraver models of the 2448 machine had their Y axis rail assembly laying flat... one rail behind the other where the router models had their Y axis rails standing on edge with one rail above the other. The router models had a nice big plate for a z axis.... you could hang anything on there.
Regards the engraver models, their whole Y axis carriage was a section of specific extrusion and kind of difficult to put much on it like a router.
Perhaps you are lucky enough to have the router version with two engraver attachments on it ?? They did sell engraving heads that bolted onto the main Z axis plate. EITHER WAY, you are one lucky, LUCKY guy to get that machine..... I'd GLADLY take another that size and that style (though I do wonder where I would put it!)