@TimeFlipper that may be so, have you considered building one yourself?
Considering the parts may be acquired cheaply enough, as you have referred to quite a bit.
On the point of safety ive used it enough times now and i havent ended up disappearing though i havent used it over a said vortex.
Some may also use it a more so radionics device instead of Timetravel.
Anyway maybe i havent tuned myself or the said device in the correct way time will tell
One thing i will say is i have tried it out, were others havent.