I tend to use native elements unless it simply can't be done without too much effort. I think this is made for the mesh tool.
1. In 11 I would create a new worksheet. *
2. Draw the spine in profile
3. Draw 1' to 6" (depending on desired resolution) horizontal lines from the base of the spine all the way to the top to intersect with the spine profile. Then project long lines down from these points.
4. Go to the plan and turn on the trace feature and show the new worksheet. Position it above the area you wish to make it.
5. Draw the shape of the tent in plan
6. Using the offset feature, draw a polyline inside with the shape of the tent and offset it to the amount shown in the tracing where it intersects.
7. Once you have them all done, use the magic wand to create new points on the mesh.
8. Elevate the mesh points at either 1' or 6"; what ever you chose before.
9a. Use a round column in the center placed on an S.E.O. layer (that is always turned off) and subtract from the mesh's center... or... **
9b. Just draw a circular hole in the mesh the same way you made the points.
10. Set the mesh to planar.
And there you have it!
* Of course if you are in 9 or 10, then you would just draw the spine profile in the plan window. 11 enables you to keep it around in the worksheet and reference by trace whenever you need it again!
** I would probably use S.E.O. so that I could resize the hole whenever needed, and it won't compromise the original mesh shape with permanently altering it.
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