Baseboard Fabrication 2 (making)

Using the dimensions from the SketchUp model I made, which incorporated the MDF thickness (9mm) into the components, I was able to saw the MDF and assemble the whole thing in less than 2 hours. I made the model to help me find the correct dimensions because I've had serious problems working out side panel lengths in the past when only relying on my ability to calculate them.
As the baseboard is close to a metre square I decided it would be best to include a beam across the middle to support the weight of the model or, at least, prevent the top of from bowing too much. This piece was simply a third side panel tacked and glued into place with wood glue and veneer pins.
I also used filler to solidify the corner joints of the baseboard, something I might find I will regret in the near future as it will get in the way of the feet I intend to put on the box. A rash decision, but hopefully easily rectified.

Baseboard without paved area attached

Underside of baseboard showing supportive beam