Wayne Parham Messages: 18786 Registered: January 2001
Illuminati (33rd Degree)
The side panels are longer since their angle is greater. When I did the original prototypes, I cut them as shown in the plans. Later, the cabinet shop made a 3D model for cutting the panels and a jig for assembly.
None of that really helps much. What I suggest is that you make the top and bottom panels long enough they match the side pieces. The final result should be a horn that has 12" x 24" mouth and 4.5" square throat.