Hi Philip, I'm glad that's what you were shooting for.

> Is there an instruction video or tutorial for the blend function?

I think that several of Mike Maynard's tutorials use Blend:
http://www.k4icy.com/tutorials.html


> Now I am trying to reproduce your result.

Because you have a different number of sharp corners between the pieces, you'll probably want to do the blend in a couple of different steps rather than trying to do the whole closed loop in one go (which you can do in other circumstances just not in this particular case).

So to start with to get the main piece, you just select these 2 edges and run Construct > Blend:



That builds an outside corner piece like this:



Then on the inside part, I think I did another separate blend there, then used Network do do the floor part. After you have constructed the various pieces use Edit > Join to glue them together.

- Michael