I used this technique to build "Miss Atomic Bomb 1957" -- basically a stretched BT-80 V-2 w/ bomb-like fins.
I originally started out like you mention above, using longitudinal strips, but did not like the way they turned out. I used the thin WalMart poster board like you describe, and regular Elmers' white glue.
At the NARCON in Kansas, we toured the Cosmosphere and I saw the the real V-2 was not built with long strips, but panels that were closer to the transitions like you are using. I came back home and drew up a series of transitions that approximated the ogive shape. I was too lazy to build another rib structure (from mat board), so I glued the transitions down over the existing "strip cone" and ended up with a wrinkly surface that needed lots of filler!
I had the rib structure for the tailcone built, but not covered, so it looked a little better with the transitions. But I used curved ribs with the ogive shape, and discovered it still wrinkled...I think using ribs with straight edges that match the transitions would turn out even better.
The finished model is heavy with all the filler, but it flys pretty nice. It is pretty overstable with all the fin area and heavy nose, so I have to make sure I aim it downwind if it is very windy (which is about all the time in Oklahoma
)
So, I guess great minds think alike...good luck on your build. I was surprised I got away with approximating an ogive with as few conic sections as I did...from 5 feet away it looks like a stock Estes V-2 nose and tail!