No offense intended, but I've always found it odd that people try to adapt the pony to human technology which doesn't make a whole lot of sense. I've yet to understand how a pony could use a screwdriver, frankly, given the need to rotate it (torque?) which is trickier than just holding onto one and practically designed for human usage. It would seem more sensible to try and imagine what a pony would have come up with minus any reference to Earth. The homage to vacuum tubes is interesting, but the vacuum part doesn't make a lot of sense with gems. I mean, why would the gems overheat? A mounting more like you'd find on a ring or necklace might look more sensible than two wires running to it.