Mini Models of some of the helpful products available 

Kirb Perfect cross section with cultured white marble threshold, also shown Quick Pitch, Postie Weep and Oatey 3 Part Drain

 

Close up of Positive Weep Protector placement, also 4" center ring and Oatey 3 part drain with round stainless steel grate 

Universal Threshold, OneLiner shower pan liner, Quick Pitch standard with Positive Weep Protector and Oatey 3 part drain 

Close up of Universal Threshold, used with OneLiner shower pan. 

Another look at the system above with the cultured marble ramp.

Cultured Marble ramp in white shown Kirb Perfect topped with the cultured marble threshold.