I've never done one before, but it seems like you would want the drain area of the shower to be lower than the rest of your bathroom. So you would really need to bring the shower floor down below your 3/8'' and build up a slope like BB is saying. Probably wouldn't need much slope as long as your drain is efficient and your shower head isn't putting out some high volume or multiple heads, doesn't look like that from the picture.
"This is My commandment, that you love one another as I have loved you." John 15:12
"Strive for peace with everyone, and for the holiness without which no one will see the Lord." Hebrews 12:14
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