Assembly is easy.
Push the pipe fittings onto the sticks.
That's all there is to it.
The diagrams show which pieces I used and how I assembled them. My displays may not be to scale, but they look good and you know what a doll is doing so it's close enough for me. Once you start building, you will discover what works best for you.
For best results, squeeze the fittings and dowels together firmly but not too tight or they may be difficult to pull apart. When everything is assembled, square them up, so the display is straight. The caps go on the ends of the dowels. They aren't necessary but they make the finished display look nice.
Have fun!
Follow the links to see photos of the finished displays.
Ballet Barre
Make your barre as tall and as long as you like. 8" is close to standard height but 6" is a nice height for leg stretches. 
1 - 16" to 24"
2 - 6" or 8"
4 - 4"
2 elbows
4 Ts
4 caps
2 - 6" or 8"
4 - 4"
2 elbows
4 Ts
4 caps
2 -16"
2 -20"
2 -12"
4 -4"
2 -6"
4 elbows
4 Ts
4 caps
4 -8"
2 -16"
4 -4"
2 -6"
4 elbows
4 Ts
4 caps
2 -16"
4 -4"
2 -6"
4 elbows
4 Ts
4 caps
4 -8"2 -16"
2 -12"
2 -4"
2 Ts
4 Elbows
2 Connectors
2 Caps
Net
2 -12"
2 -4"
2 Ts
4 Elbows
2 Connectors
2 Caps
Net
Use the 2 connectors to join the 12" and the 4" sticks.
4 -20"
2 -16"
2 -12"
2 -4"
2 Ts
4 Elbows
2 Connectors
2 Caps
Net
2 -12"
2 -4"
2 Ts
4 Elbows
2 Connectors
2 Caps
Net
Use the 2 connectors to join the 12" and the 4" sticks.
2 -16"
2 -20"
4 -8"
4 -4"
4 Ts
4 Elbows
4 Caps
Clothes Line
2 -20"
2 -16"
2 -12"
4 Elbows
2 Ts
Net
2 -12"
4 Elbows
2 Ts
Net
2 -20"
2 -16"
2 -12"
4 Elbows
2 Ts
2 -16"
2 -12"
4 Elbows
2 Ts
Net
1 -20"
5 -4"
2 -8"
3 Ts
1Connector
Basketball hoop
Basketball hoop
Use the connector to join the 20" and the 4" sticks to make the post.
I found my basketball hoop in the dollar bins at Joann's and attached it to the top of the post with tape.
2 -12"
4 -8"1 -20"
4 -4"
4 Ts
2 Elbows
4 Caps
3 -6"
4 -8"
4 -8"
4 -4"
4-45 Degree Elbows
4 -90 Degree Elbows
4-45 Degree Elbows
4 -90 Degree Elbows
2 Ts
4 -20"
1 -16"
4 -4"
4 Elbows
2 Ts
4 Caps
4 -4"
4 Elbows
2 Ts
4 Caps
2 -3"
4 -4"
2 Elbows
2 Ts
4 Caps
4 -4"
2 Elbows
2 Ts
4 Caps
Craft at your own risk!