A thing in consideration to Tesla extra-ordinary capability of being capable of working and progressively develop things inside his imagination. I think such kind of capabilites should be investigated and if possible stimulated more intensively. This is a capability of ours. Everyone has dreams for example. And one of the greatest thing about dreams is that there is not a thing that is not possible. You can imagine whatever you please literally. As much as you are unbounded. Along with this you can actually work on things test them and develop them such that they have relation to lets say actual reality - like Tesla did. In the context of this one asks oneself -How much control of this proccess can one actually have and to what degree it allows itself to be shaped? I imagine that this proccess is beyond computers power.
For example all of dreams i had are extraordinary to me and everyone can say the same about their own dreams i think. The interesting part is that if you actually gain some of the focus that you have when being in conscious state, while dreaming for example, then you can control this proccess to some level i think. I beleive i have experienced that and all i can say is that everything completely "obeys" me. Everything follows my "desire" without a bit of resistence. Additional example - in dreams you can fly thus you can turn off gravity in such virtual reality. It seems like its not about what is physically possible but its more like -what you allow, need or desire to be. I think its one of the most interesting aspects of our mind. It can be used ( it seems so) like a virtual laboratory. You can explore your thoughts, test things, build entire worlds in there i think. If one imagines a virtual enviroment made by yourself which can be left to itself so that you can work on its peculiarities thus put differently your thoughts are automated to some degree while you are working on finer details in "real time " interactively. So you actually dont need to have actual awareness or control of the entire structure. It sustains itself as long as you need it for example.

Tesla was able to see every detail of every machine in his mind before he ever built it. He did have some unique abilities. He could envision so much that he did not have enough time to build everything he thought of.

He had a combination of two traits that are not usually found together in most people. He had imagination and visualization abilities but also calculation abilities. Usually great calculator types lack imagination, and great visualizers lack calculation. The two together is a powerful combination.