To start this project, you’ll need to cut the timber and backing for your frame. You can have the MDF board for the backing cut at your local Bunnings. We had our backing board cut to 300mm x 400mm, and we made our frame 435mm x 335mm.
To cut the timber for your frame, make a 45-degree mitre cut at the end of your timber and measure out 435mm for where your next mitre cut will be. For this cut, make the cut in the opposite direction. Check that your measurement of 435mm is from long point to long point to get the right length.