How to make a centrifugal pump casing?

Hi,

I am trying to make a centrifugal pump casing (similar to image 4), but do not know how to connect the discharge tube.

I created the highlighted parts of picture 1 using revolves. The remainder was created using 2 lofts. What technique/methodology do you recommend for making the rest of the part.

I have been toying around with different lofts, loft cuts, extrudes, etc. but with no luck.

Any help would be greatly appreciated. Thanks in advance.

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