Re: Boolean question (I think)
Woody is correct about the edges. The Boolean ops sometimes leave T-junctions and might leave vertices which are not shared. Jeff is working on fix for this.
It can leave some very thin triangles so even if it looks like two surfaces are adjacent - there may be another in the middle.
I suggest you select surfaces in pairs (or low numbers) and press c to combine. Remember that you can't have single polygons that contain holes in them so - to have a rectangle with a hole in it, you need at least two polygons.
You may find it better to make this shape another way e.g. revolve a line and flatten the edge vertices. Or, make a cylinder (with no ends) and stretch and flatten one end over the other, then even out the edge vertices. There are a number of ways to accomplish the same shape.
Andy
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