Please read the description!

This is an XML edited fuselage that can carry the new astronauts in it and be shaped like a normal fuel tank. This may prove very helpful for people making custom capsules for their astronauts.

However, there is a fairly significant bug with it, so please read this description to avoid that.

If you try to set this as the primary command vessel, launching the craft will simply boot you back to the designer, so don't do that. instead, you should set the primary command part to a command chip (or a pod, but that'd sorta defeat the purpose of this).
Also, you have to scroll down a fair bit to get to the EVA buttons. I can't change the size of the part panel so it's a bit tiny.

There are probably some other issues with it, so if you find any be sure to tell me.