Autopipe Vessel Tank

Dear All,

I'm having troubles when trying to model the Storage tank in Autopipe Vessel Model. Please help this following questions:

1. My tank height has 27m and width 18m, Autopipe vessel has maximum high option only up to 25m, please correct if i'm wrong.

2. How to model the roof manhole/nozzles?

3. How to assign the rafter/column/girders structural shape in roof design?