My 1st attempt to construct this was from individually printed parts and then glued together. When I got it all together I found that it was out of tru (ie, not rectangular). So I took all the frame parts into Tinkercad and put them together, then merged the parts into one form. Then I printed that.

• NOTE: I printed everything in this post. If you choose to print this, it will all print and it will all fit together. Enjoy.