OK, so I'm trying to scratchbuild a Hoth Golan Arms Df.9 battery (the big white turret). I'm trying to build the center tube piece. I've measured everything out. The bottom diameter is 7.1 cm, top diameter is 6.9 cm, and the height is 7 cm. Is there a pattern for laying this out on sheet styrene so I can cut it out and curve it into the tube I need with those dimensions?

Any help is greatly appreciated!