Hi MAT, also if the difference in z is small enough that it won't cause any downstream issues you can close it off using the Construct > Loft command instead of Planar.
To do that, select the 2 edges and then run the Construct > Loft command and uncheck the "Cap ends" option so it won't try to put end caps on it.
Then you can use Edit > Join to glue the pieces together into a solid.
The bottom will have a slight warp or something in it instead of being totally flat but it's pretty slight.
The other thing you could do is stretch out the inner and outer surfaces and then trim them with a common line at the level you want so they'll be on the same plane.
- Michael
|