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Start with the base of the unit by adding a nipple and a T-joint to start the frame.
Add another nipple to the top of the t-joint.
Attach an arm to the nipple. The arm is composed of a T-joint, a long nipple and an end cap at the end. Face this arm away from the inside of the lumber rack. It's one of the supports for the hardwood lumber.
Note: The length of the nipple depends of how big the lumber rack will be. Just be sure not to make the arms so long that they can't support the weight of the lumber.
To the top of t-joint, add a long nipple and another T-joint.
Put a long nipple at the top of that T-joint, then add a longer piece at the bottom of the T that will connect with the other side of the rack.
Add another T-joint to the top with an arm coming from the bottom of the T.
Add a long nipple with an elbow joint to the top of the t-joint. Put another long nipple on the other side of the elbow joint.
Repeat these steps to build the other side of this half of the unit.
At the top of the unit, you will see that the two pieces do not connect because they are both right-threaded. Use a union joint to connect the pieces.
Repeat all of the steps to build the second half of the unit.
Use union joints to connect both halves.