build one, , made multiple test, all these little box device never work, i dont know by now still if you would need to be shielded from the environment or not, , but i do know how to make the machine, my issue as i think everyone else is sufficient time and money to do it, im not doc brown i didnt get much inheritance yet as both my parents are still alive, and the loto is just unobtainable even do i play it everyday here, me and dr y , know how to do it, we both just dont have the time to do it, what a waste, i feel we are wasting our life away