now is the time to consider these drain changes. the plumbing rough in would have to be changed and the placement of the new channel drain would be changed. I prefer not to stand on a drain in the shower. Channel drain will be installed at the opposite end of your floor pitch ie: need to be at lowest point. Most important! have plumber check for "air lock" in drain pipes before the first shower use. sometimes the air lock will prevent water from going down drain and with zero entry you would get flooded. This may happen with new or remodeled plumbing. good luck with your design.

Hi tsumommy - Anything can be changed, the critical question is "At what time and cost?" The exact conditions of your situation will dictate the answer to that question. The best approach is to get all of the players (you, the architect, the builder, the plumber, etc.) involved together so you can brainstorm with them the possible solutions. Good luck and have fun!

Thank you both for the input!

@Bud: Indeed I'm finding out the "at what time and what cost" theory. My home is contemporary (mid-century modern) and I'm the builder as well. My architect and I absolutely love MCM but we are finding that some of the subs are scratching their heads at the design. You see, I'm building in the deep South where most homes are Acadian style or the dreaded cookie cutter French country.
Thank you for your ideabooks -- I have several saved in my collection.

please check proper procedure fof waterproofing your shower floor. I know code in this area is not good enough for a good watertight tile floor. Check out the profiles for the channel drains too. you basically decide how and which direction you want the water to drain and there are many shapes of channel drains ( i.e. in a corner, right, left) to accomodate your needs.

have you seen the channel drains that light up when water hits the drain? there is no electricity involved, just LED's and batteries.