Maybe Viacad 3d could do 3d dimensioning?
As Michael says, Sketchup is not so bad, I don't thing there is many affordable packages that does this.
There's a couple of free 2d drafting programs, I think some of them accepts 3d information (just for viewing and dimensioning):
-Doublecad XT
-Solidedge Free2D
-Draftsight
-Progecad Smart.
None of them are easy to use though.
Let us know if you make discoveries on that topic!
I sure hope Moi would have some, It would fill a non-existing place in the "affordable and easy to use" world of detailing.
Hope this helps a bit
Marc
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