Follow the pictures to assemble the frame. All the parts are fixed together with liquid solvent cement - I used a syringe with a blunt needle but you can also use a paint brush.

I've labeled some of the parts to help put them in the correct position.

Start with the top frame strengthener.

Now on to the inner frame.

Note: This picture is from an earlier version. I've moved the position of the hole in the bottom plate to the other side in the current version.