I'm not going to repeat the whole mumbo jumbo about tools, supplies and budget since its the same as before. Just make sure you are using a stronger core (F25)- too thin pipes will bend a lot.
What you want to do - is follow the warhammer guide until the point where you start shaping the head. For the record, here I'm recycling an old weapon again so I kinda start halfway finished. Yeah I'm big on recycling if you haven't noticed by now.
The head is for a single edged axe, if you want you can make it double edged - its not an issue. What you need to do though, is make sure the head is one idea tougher than the warhammer - since its bigger it has to be stronger as well.
The axe already came with a counterweight fixed in. Note that the axe will have a frontal center of balance - its how it should be anyway - we are not making a sword after all. Still, a counterweight and pommel will help with easier control and handling.
After that scraps from flipflops that were turned into soft knives the week before, are taped to the core. This will help with having a better grip and keeping your buddy safe from accidental hits with the pipe.
Finally some leather for the handle grip and we can move to the edge.