Best way to handle rolled sheet metal parts

Rolled sheet metal parts...

After creating a "tube" that I revolve 359.99 degrees (to get aseam), I'll add holes to the shell. When I unfold the shell, theholes are obviously not round anymore, and they don't havetemporary axes. They also don't simulate the fact that when thesheet is punched in the flat, the holes will obviously be round.

What is the best way to handle sheet work like this? It's a loteasier to locate the holes when the part is round rather than doingthe math on every hole and adding it to the flat, this seemscounter-productuve.SolidworksParts And Features