Thanks for the plug-in Fredo. It seems to do a fine job.

My issue is not in getting the tool to work - my issue is what is happening you my shape after the round-over.

What I'm working on is not a complex shape - it's essentially a rectangle 15x100x455 mm. The top face has a radius of 254mm into it. It's a long box with a grove in it

My issue is that after I round all my edges the "entities" in SketchUp are basically lost. I now have an amorphous rectangle shape and I've lost all the "dimensional attributes" to all the elements/faces - I cannot submit this to a manufacturer for production with the dimensional data visible as I'd like to.

I am arguably very new to SketchUp - have I missed something obvious here - perhaps some sort of layering or overlay where I can apply the round-over and still have all the "square" reference data in place?

EDIT:
Well - I can use the dimensions tool to indicate the dimensions, and that's technically "good enough" for my need. But I'm still curious to know if there's a way to keep that entity data in place.....