About location inquiry

Datums B and C are width dimensions so, personally, I'm of the opinion that you should be using constructed widths for those datums instead of lines.  Either way, if the drawing is calling out position, that's the control you should use (unless of course it's a situation where the engineer should have used a better suited control for that characteristic). 

Do you think Feature Locaiton TP query is a correct query?

the Drawing is implying a center axis line between midPLANE A and midPLANE B.

You are constructing the datum features, seemingly in only two dimensions.  Think 3 dimensionally to establish the correct datum.

Each line you made should be replaced with a plane.

The part size is too small, ok I will try with the plane as you said.

Especially where the B datum is desired, I can make a 2mm wide plane downwards.

12.2 I can't check the plane because it is 2 lines in Z axis, 1 mm width. For this reason, I made 1 line to the center for 2 datums. Also, should I select all X Y Z axes during position query?

12.2 I can't check the plane because it is 2 lines in Z axis, 1 mm width. For this reason, I made 1 line to the center for 2 datums. Also, should I select all X Y Z axes during position query?