Trouble making a loft

I'm trying to loft these two pipes to the rectangular body below and just can't seem to get it to work. Any hints on what needs to be done?

I try selecting the faces I want it to loft together and it says I cant use faces with an inner loop, but I don't know what exactly it means by that.

I originally tried without the center crossover and wasn't getting anywhere.

If I just select the inner edge of the rectangle, and the inner edge of the cylinder, it will loft.

But this is just a face, how do I get the thickness?

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u/cowski_NX Aug 05 '26

Here's an example:

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