Still not convinced?
I'm not surprised that with a lot of fiddling and kludging such sensors might be made to work, a little bit. Sort of like using a radio transmitter without any antenna.
The last image you posted showed an incredibly clumsy sensor, in a mason jar with thumbprinted plasticine seals, possibly recording depth measurements of 160 cm. How is that useful?
What is the point, when you can buy a sensor, for less than the cost of the Maxbotix, but designed and well suited for the task?