Thanks for all the great suggestions,
I will try a few things out in the coming weeks,
G

@garyion said:

My wish is for Sketchup is simple - to work like a typical CAD package.

Firstly to be able control Line Weights -
maybe like via layers or object properties like autocad
Black - 0.18mm
yellow - 0.35mm
Brown - 0.5
to create quick legible drawings.

Auto hatching when sectioning thru objects -
Trimble buy and integrate Skalp
to create quick legible drawings.

Auto Dimension - Similar to Autocad inventor
To auto dimension a plan or section in an architectural manner.
http://www.autodesk.co.uk/products/inventor/features/all/gallery-view
see - Manufacturing and design documentation video
to create quick legible drawings.

Trimble buy Skalp? I like the idea 😄
I don't think that will happen soon. But I can tell you all other things are on our to do list. We work full-time on Skalp and it's our intension to make more of Skalp than just a section plugin. I can only ask you to support us and you won't regret it in the future.

If all you actually want is a 'flat' 2d object made from lines and true arcs/circles, then you need to copy your SKP, then edit it - looking 'edge on' using a selection by fence, so the unwanted faceted 'sides' etc, and top face of the form can be deleted.
Now you should have a 'flat' 2d set of geometry.
If your cutter doesn't need faces you can delete those too.
Now you should have a set of lines, arcs and circles.
Export those as the 3d DXF and you should then just get the paths you want...
Do not use a 2d DXF as that does NOT keep arcs/circles but makes them out of segments...