Look at my previous post. The right image is the sweep layout within a family. You can use a generic, non-hosted family or a floor hosted family ... a furniture family ... any of those templates to create the family. If you look at that image, I have two parameters (they are lables for dimensions within the family.) One is the angle, the other is a radius. I started out by laying out my tow angled reference planes as equal angles from the center reference. Then I dimensioned this angle and referenced it to an instance based label I called angle. I then added a referce arc with the center at the intersection of the three planes and extending from one angle to the other. I added a reference radius dimension then changed that to an instance based label called radius. Now I created a sweep extrusion. I described the path by pointing to the referce arc line ... path done! No need to dimension or lock anything. I then switched to the profile, opened up a side elevation and drew a profile much like yours. Done with profile, done with extrusion, saved profile with a name and loaded it into my project. I placed an instance of this pew setting the angle and radius. I suggest you pick a middle one... reason comes later. Pick it and copy in place (hit a 0 when prompted for new location). Now click on the pew that you see (they latest will be picked). Change its' properties to a new radius - old radius + pew spacing. Now you have two pews with same center point. Pick both pews and copy in same place. Change outer one to last radius + spacing. Change the inner one to originalradius - spacing. Now you have 4. Copy outer 2 and do it again.
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