Oval spa into a rectangular bathroom

I have a stylus 1800 long oval shaped spa bath going into one end of my bathroom which is 2200 wide and was wondering what is done to mount it. I have instructions but they are for rectangle baths which is easy to understand. In breif they say build a retaining wall around the base of the bath and fill with mortar slurry then place bath into this mix

What happens around the curved sections of the bath. Do they just brick up around the perimeter of the bath and then fill in the corners with more bricks and fill the gaps with cement.??

I want the tiles to sit under the rim of the bath and not cut and grouted around the edge which is common. How is this acheived.
Do I allow for the tile thickness and adhesive and the tile is slid into position or do you remove the bath once the cement slurry has dryed then tile and refit the bath or build the hob then tile and then fit the bath into wet slurry mix.
I know a plumber will be doing it but I want to know so it gets done my way.


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