How is the T1000 made?

"How the hell is it possible to make a T1000?"

Presumably with technology that is frighteningly-beyond-our-imaginings ultra advanced.

There are plenty of technological wonders we have today that would have seemed like magic in earlier centuries.

In 1895 Lord Kelvin said "Heavier-than-air flying machines are impossible." While it's not possible to create a shape-shifting liquid metal robot now, we can't really say that it can never be done.

All it is is a mold of metal that can reconstruct itself. Look at Mercury, it's just metal; however, it can be liquid at room temperature. If you bring in T3, all the T-1000 is is an autonomous exterior of he TX. Instead of a solid metal frame and magnet attracting the liquid upon itself, it is just a a bunch of nanobot looking things that build itself up on a central core, of which is also made of liquid metal.

Using scenes from the movie, we can say that there is a core because towards the end, when it gets blown through, the head seems to scream as if it has been hurt or "hit". Whatever the grenade did to it, it hit the central core pretty bad. So in that case, the central core is located near the navel.

I would have really wanted to see what would happen if Arnold threw the pieces of liquid metal into the boiling vat, at the time the T-1000 was frozen. Would it have come back smaller or would it have just become totally useless due to the amount of metal it had lost? That would have answered more of our questions. Every machine has a central core that keeps everything else in check.

THERE IS NOTHING TO FEAR. COLLEGE FOOTBALL IS HERE!!!

My guess is that the same entity that made the TDE, which is used to go back through time(heck, here's fantasy beyond all hope) did indeed make the T-1000 as well.
Now, surely, one might say why doesnt the TDE allow clothes nor metal, but did allow liquid metal as a T-1000 but heck who is nitpicking?

It's not designed Mechanically, The T-1000 is designed Chemically

So in that case, the central core is located near the navel.

The T-1000 Terminator was constructed deep within Skynet's main complex. Within a large heavily guarded room, the mimetic polyalloy was poured into a massive machine press that fills floor to ceiling. Feeder pipes emerging from the walls and centering on the press like a hub poured the mimetic polyalloy between two 20-ton plates. These plates were then hydraulically pressed together and met, forming the indentation of a man. The mimetic polyalloy then filled this indentation and solidified, setting its default molecular structure.
The T-1000 was constructed using a new technology developed by Skynet. Each molecule of the T-1000 was a primitive miniaturized version of the total machine. Every molecule had the blueprints programmed into them for all the necessary parts required for construction of the whole T-1000.