There's no indication that they did make it (at least at a level above wind tunnel mules), and at least a little bit of data suggesting that they didn't. Avro Canada was stuck on two visions at the time: the saucer concept and the Arrow. Toward the end of Avro Canada there were concept illustrations of a Mark III Arrow, which had a "saucer section" embedded in an oversized Arrow fuselage in place of conventional (delta) wings. (The illustrations lived on into the '60s, if I remember my "How and Why Wonder Books" correctly, since they didn't fall under the "destroy all Arrow data" decree, being substantially dissimilar to the CF-105.) That would seem to indicate that there were terminal stability/control issues requiring at least a rudder and conventional directed thrust, given the technology of the day -- but with, perhaps, enough promise that there was some genuine fear that the Soviets could make something of it. The MiG 15 had come of something of a shock not long before, and Sputnik was, I think, foreseeable by then. Putting the 50-year stamp on the project may have seemed very reasonable at the time, even if nothing viable came of it.