Is my baseboard strong enough?

After all the planning it was time to build an actual baseboard. I had to compromise some aspects because I wanted the baseboard to be at least semi-portable. To keep it light I just used 3 mm MDF on 20 x 40 mm dressed pine. Not the strongest material, I admit, but like I said, this is a compromise.

All set and as long as I don't sit on it, it should be ok. Pics should follow soon.

Update: Here is the plan...