bathroom reno in progress need your opinion guys

i am installing a rectangular bath in the corner of the bathroom
Checking into the studs is the way i have decided to go but now i have a problem
i also want the bath to be also installed inside a HOB (frame) with a tiled finish.....

where the bath sits on the hob edge does it sit on top of the tiles or straight onto with the blue board. If installed straight onto the blue board then tile around bath and seal with silicon in the edges... picture may help below

what should i do ?

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