JBC NT105-A Nano Soldering Iron *Homemade driver

Hello again chaps!

I've had my eye on this little beauty for some time now, alas the price of the NAST station (over 900 euros) is way out of my reach.

So I've decided to build my own homemade one.
I mean how hard could it be?
A little PWM, some PID reading, and a display, is really all there is to it.

So, before I start drawing, I am asking you folks, for any advise, idea, a schematic would be nice too...
for starters, how much current do you think this little thing requires?

As always, thank you for your time and answers.

Temperature selection from 90°C (190°F) to 400°C (752°F) (±5%).
Output Peak Power: 12W. Output: 7,5V.
You could probably use anyone's control unit.
Can you buy their replacement heating element, sensor and tips?
I like the grip being so close to the tip. The grip is probably made of silicone.

Thank you for the reply.

It seems pretty simple, in deed.
The connector might prove a little difficult to figure out though.

Did you consider cheaper alternatives?
The T210 tool is almost as small as the NT105 and is specifically designed for SMT, with tips as small as 0.1 mm.
The tool can be used with JBC CD-2BB compact stations (~360€) and also with any modular control unit, like the DI-2B.
There is a user on the EEVblog forum who sells these stations. It may be worth to check.