Think that
Bb has us a wee bit off track.
The West Door of Moria could be simply a voice-activated door keyed to a specific word.
For Bill the Pony, we could just have a pony or the
"Big Dog" four-legged walking robot. Similarly, Dwarves could be technology-enhanced humans. There's a framework that one can wear that allows the wearer to carry much heavier loads than normal possible. A person can move while wearing this structure as onboard computers assist.
Still, even with our advanced technology, one can only be 'so pretty,' and so we may never achieve elfdom.