K40 Adjustable Bed

This is my first remix design. I reworked the original in Fusion 360 to give me a more rigid design. The top of the bed cannot bend inward due to the upper frame and nuts holding it to the threaded rod posts. Adjustments are easily done with a screwdriver. Hopefully the pictures/video make sense. Please refer to the original design by brianvanh for more details on exactly how it goes together, but it should be pretty clear from the photos I took as well. Here is a video of the bed in "action" https://youtu.be/lJH4dM1vxqo

***In the video, I have not yet updated to the square tubing frame. You may be able to see the "flexing" I experienced with the aluminum angle. Please refer to the pictures for details.***

TENSIONER:
I added a belt tensioner as I had issues with belt tension. You can see in the pictures that the tensioner is a simple pulley bolted into a slot made in a small piece of aluminum flat. The tensioner is riveted to the lower frame. the tensioner pulley ca