At the shop for around 2hrs discussing on how to make the dual front discs instead of original single disc.
After two days, they have completed the mounting with perfect air-gap from the wheel to both front forks, and also the two break calipers.
There are two shim plates have been inserted into both side of the "rim base" (well, I am not sure if I am using incorrect word!!??).
Because of the differences between two sides of the rim, so two plates have difference thickness. That was a difficult part for getting a correct measurement. Otherwise, the two discs could not fit with the two break calipers.
We used long bolts to mount the break disc and the shim plate to the "rim base".
So, here is how the front end looks like:
The wheel looks bigger than with the single disc, right??