What is the best way to model a steel transition cap?

I am new to STAAD pro connect. I need some help on how to model a steel transition cap shown in the attached photo. The cap consists of two top and bottom plates separated by cylindrical section. There are 24 gussets attached to the outer perimeter of the cylinder. The cylinder is (54.7 x 1.5 x 8 in) OD, Thickness, height. The two plates have 30 in diameter hole. The top plate is 68 x 68 x 3 in and the bottom plate is 74 x 74 x 3 in. The difficult part for me is the mid cylinder with gussets (gussets dimensions: 6.25 x 8 x 1.5 in (width, height, thickness). I want to make sure I will have a proper mesh of the cap at the end, especially at the connections between the vertical cylinder and the top and bottom plates. 

Thank you in advance for your help.

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