Cylinder with multiple inlet and outlet pipes

[MaguRaam]

Hi,

I attempted to create a cylinder with four holes that will eventually be connected to inlet and outlet pipes. I have attached a rough script that does this traditionally by combining multiple blocks, but I'm having trouble closing the cylinder at the bottom. It may have been better to start with a custom sketch and then extrude it. I would not have ended up with a dirty script.

Could you please advise on the best approach to achieve this classier, more reusable way?

Thank you!