I've been wanting a marudai for a long while now, but couldn't justify the cost of one. so I turned to the recycling bin.
I used 5 soup cans and cut booth ends out if three and one end on the other 2
next crimp one end of each can exept the bottom one. stack them together and duct tape together.
lastly cut a hole in the top, and access holes along the sides. I ended up lining all cuts with duct tape cause my metal work is terrible :) I added a kumihimo disk to the top of mine cause I like having the small notches, but its not necessary.