 I had to use the larger ends of each of the 1-1/2" tubes (unless you can get a hold of 1-1/2" ID tube).  
Using this template, mark each piece for the angle cuts for the shroud. Remember that the angle is for the front of the shroud is different than for the back of the shroud. 
It's easier if you cut the template into two pieces, on the line shown; then tape the template pieces to the end of each tube with the straight edge facing out, as shown. 
 
After you cut the angles, the two halves should fit together like this, and be 2-7/8" in length along the top edge Set these aside for now. 
Next, cut the main tube to length. Measure and cut one of the 1-1/2" PVC tubes to 10" length. 
Insert the 3/4 x 3/4 coupler into one end of the main tube (ribs facing into the tube)and glue in place. 
The ribs on the adapter keep it centered in the tube. 
Fill the gap around the adapter with body filler. 
Once the body filler has hardened, sand it smooth. 
Take the 3/4 x 1/2 flush bushing and file a bevel about 1/2" down from the top. I used body filler to make it thicker. 
You want to get the "cone" shape even all the way around, so the gap where it will meet the other part of the "emitter" will be minimal. 
Once you're satisfied how these two pieces fit, set them aside for now. Do not glue them together yet. 
Glue the two halves of the shroud on, leaving 3/8" of the main tube out of the front of the shroud. 
Fill the gap between the two shroud pieces with body filler, and sand smooth. 
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