well she does share a slightly altered version of the nacelles of the sovereign class, albeit the oddy (odyssey nickname in sto) is up scaled. the "struts" that connect the nacelles to the engineering section are similar but different enough that modification would be necessary. and the front of the galaxy class could be modified to act as a basis for the front of the engineering section around the deflector dish with a sovereign model being used to work the aft end of it. and again the sovereign saucer section modified would made the oddy saucer section and you could rework the "struts" to act as the connection between the saucer and the main body. it is possible to build, but it would require a lot of kit bashing and scaling but it would be possible, but I would love to see one originally built, as with all the unique ships in sto.