What you need:
All pipe and fittings are "Schedule 40" PVC.  The plumbing supply, hardware or building supply store clerk will know what that means. The PVC will need to be cut. Measurements are listed below

 (4) 1.5" x 10' pieces of pipe
 (1) 1.25" x 10' piece of pipe
 (2) 1.5" 90 degree elbows
 (2) 1.5" to 1.25" bushings (reducers)
 (4) 1.5" Tees
 (4) 1.5" caps
      Light hammer of block of wood
Cut or have the hardware store cut the pvc pipe into the following measurements

 (3) pieces of 1.5" pipe 8 feet long
 (1) piece of 1.25" pipe 8 feet long
 (2) pieces of 1.5" pipe 3 inches long
 (4) pieces of 1.5" pipe 2 feet long

Assembly:
Assemble the entire stand dry. DO NOT GLUE
Use a light hammer or block of wood to tap all joints together tightly.

Square: Refer to photo of finished stand 
1. Tap the reducers into the elbows. This will be the top portion of the stand.
2. Tap the elbows into two of the 1.5" x 8' pvc pipes. These will be the uprights.
3. Tap the Tees on the opposite ends of the uprights.
4. Finish square by inserting 1.25" x 8' pipe  into elbows (with reducers) and adding 1.5" x 8' pipe across bottom into the tees at the bottom of the uprights.

Feet: refer to photos (left and below) for feet construction and finishing

1. Place (1) cap on each piece of 2' pipe, insert those into the  remaining tee's,.
2. Insert the 3" pieces into top of the same tee's.

Put the assembled square onto the assembled feet.
Notes:  
The joints should be stiff enough to support the weight of the quilt as long as it is placed in an area with no wind.

Worst Case for glue:  ONLY glue reducers in the elbows, uprights to first set of tees, the foot assembly tee, and 3' pipe out of the top. Glue in any other joints will prevent you from dissasembling and transporting the stand or removing the quilt.
Finished PVC Quilt Stand
PVC Quilt Stand Directions
The Congenital Heart Defect Awareness Quilt Project soon discovered that purchased quilt stands were not standing up to the wear and tear that we expected for our displays.  Within a years time, the purchased and or donated stands were in bad condition. A quilt quild in Kansas donated the use of their PVC pipe stands for our annual quilt stand.  Soon after, Michael Schoeffield adapted the stand to suit our needs.  The following directions are suitable for a queen size quilt.

The Congenital Heart Defect Awareness Quilt Project, Inc. 2005

Passionately Promoting CHD Awareness 
            ...One stitch at a time
The Congenital Heart Defect Awareness Quilt Project, Inc.