(Editor’s note: This article is continued from the November issue of the River Hills Traveler.)
A dado is a rectangular groove cut into material so that a like piece may be fitted into it. Measure the thickness of a 2×4 or the material you will be using starting at the end of the 8’ mark on the first runner and then 16” on center to the first dado and then 24” on center for the third dado. 
The rest of the dados will be 16” centers to other end which will be 8’ from where you started. You should now have 6 sections of 2 marks each, squarely drawn going across both supports every 16 inches on center apart.
Note, the third floor joist from the end of the shelter will be cut to facilitate the drum diameter and a frame constructed large enough to fit the drum.
Now cut the dado joints into the supports about half the depth of the width of the joist boards you will span from side to side for the floor support (runners). The 2 bottom runners or supports will be spaced wider than the drum you will be using and centered. I usually place the barrel just between the bottom supports (runners) for sideways support, because the weight will be mostly in the drum sitting on the ground.
