Since publishing the instructions to make your own synthetic under quilt, I have made some changes which help simplify the build a little.
1. Cut Climashield and fabric to exact size needed plus hem allowance. For my 3/4 quilt the measurements of the raw fabric are approximately 1050mm x 1470mm
2. Cut out and sew the two end channels. Making the channels around 50-60mm shorter than the quilt width. I cut it 125mm x 1000mm. Hem the two short sides, and I then fold over once in half sew, and then fold in half again and sew giving you a channel which has 4 layers of fabric.
3. Place Climashield down with the two layers of fabric on top.
4. Pin the long sides ensuring you capture the two layers of fabric and Climashield.
5. Insert the end channels between the 2 layers of fabric, with the hemmed edge of the channel parallel with the edge of the fabric. Centre the channel and pin in place on both ends.
6. Starting at one of the short ends. Start sewing, with Climashield facing down, from 150mm from the middle (You are going to leave a gap of approximately 300mm at this end to turn the quilt inside out). Sew around the entire perimeter of the quilt and stopping so you have a 300mm gap to turn the quilt inside out.
7. Reach in and turn the quilt right side out.
8. Sew up the gap.
9. Install suspension tie outs as per other tutorial.
Note: You will need to check whether the Climashield gets caught on your sewing machine feed dogs - on mine it doesn't.