Beginner - how to add a rim

[bobBJHMR]

Hi team,
I'm not sure if this is the place where an absolute beginner can get help but here's hoping.
I'm just getting started so thought I'd try something fairly easy - a storage tray. I've got the basic design by following lots of tutorials online. My tray is just 1mm thick and I thought that the lip might be a bit 'flexible' so I thought I'd strengthen it by adding a rim - maybe 2mm.
One way to do this (I thought) would be to create a 2mm diameter circle sketch on the XY axis at any point on the outer rim and then use the 'sweep' function. But I can't seem to get this to work.
What I'm doing is:
Construct > Midplane >between front and back vertical faces to give me somewhere to place the sketch
Create a sketch on this plane
Choose circle and then try to locate it on the outside edge.

This is where I get stuck.  The circle doesn't constrain to the outside edge and remains 'floating' on the construction plane. Naturally - no constraint means I can't sweep it. 

Dos this make sense to anyone?

[TrippyLighting · Accepted solution]

Is this similar to what you are looking for ?

If you go through the timeline of the attached model step by step you'll see how i was constructed.

[bobBJHMR]

This is EXACTLY what I was hoping to be able to do.  Thank you.

I'll have a look for a YouTube video on how to use the timeline better ....At the moment it seems to show completed steps rather than the construction but I imagine there will be a way for me to get into more detail.  Thanks again

[TrippyLighting]

You can edit each timeline feature to invoke the UI foe each of these features.

Double-clicking on a feature will also work.

The UI for each feature will show you the tool settings what was selected in the viewport.