Rock Mosaic Tile

Can someone explain how to remodel my existing shower area, tiled, and turn it into a natural stone bathtub?
I want to use sandstone on the outside, build up the side walls with brick, and and then build a little shelf area to sit, all faced with natural rock, but how do I make it waterproof using rocks and grout? Should I lay mosaic tile inside or can I use sandstone or other stones all the way through? Explain the components of products as I am living in a non-english speaking country. The area is small, maybe1 1/2 yards by 2 1/2 yards, there is already a drain of course for the shower. I want the shower to still be used inside the tub and just have it run down the drain to be a pool/shower combo...
After you grout it really well, and clean it really well, you have to put a sealant on it.
A look at what is currently available on eBay
![]() Vintage Mid Century Modern Round Dish Mosaic Rock Tile Ashtray Trinidad Tobago US $19.99
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![]() Aspen Summit White Flat Rock Mosaic Tile US $11.00
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![]() BLACK RIVER ROCK PEBBLE STONE MOSAIC TILES US $52.99
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![]() ROCK N ROLL BORDERLESS MOSAIC TILE WALL POSTER 35" x 25" US $18.16
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![]() Multicolor Natural rock pebble mosaic tile, $59.5/Box US $54.50
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![]() Natural polished river rock pebble tile mosaic Red US $7.49
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![]() 30 Large Iridescent Glass Aquarium Rocks Garden Stones Glass Mosaic Tiles Crafts US $7.50
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