More like some junk welded together.
We never see the mechanism for elevating ? If any.
My guess, a long lever that is latched to the floor actuated by hand.
The elevation appears to work now lets see the traverse?
What is the function of the cinder block and wooden girder? Has ground pressure overcome the block wall?
Here in Illinois if you go a bit south of I-80 they know how to build a T&E mechanism just for the 4th of July.
OK, I confess I didn’t watch the video earlier. Not so “sophisticated,” then.
Looks like that place out in West Texas where they have several Cadillacs half buried in the ground like a car henge. I think they have another one in Nebraska. All that junk sticking in the ground.