Looking at my situation, 5/8" flooring and 1" of clearance from their to the threshold of the bathroom leaves me at most 1 5/8" from top of floor to threshold if I lower the flooring in the shower area to be flush with the top of the joists below. And maybe, just maybe I could squeeze and additional 1/4 to 1/2" depending if I try to lower the floor even more between the joist right where the drain is; in essence a step down from bathroom floor to shower floor and then to drain level floor.
Looking at various linear and non linear drains, it seems you need pretty close to those dimensions just to get to the top of the installed drain. Correct?
This for certain would then mean a curb on the non-door side of the shower, or the side glass would be 3/4" shorter at the back wall of the 3' deep shower which I'm not so sure will look all that great and then the glass wall then functions as the curb.
Assuming I put the drain at the door without curb at the door , then I'll have to also deal with some additional means to help prevent water overshoots of the drain and water that runs down the door from going to far into the rest of the bathroom. All these measures, and thanks again for some suggestions and ideas on that, would mean an additonal height requirement above the drain be that a 1/8" rise of tile above top of drain at drain plus some slope on door side of the drain (be that just inside the shower or outside the shower). Based on previously mentioned 5/8" max water height above drain even when not blocked, that could mean some wet area outside the door for at least 2' (at 1/2" / ft slope, more at 1/4"). Could lead to having water reaching out from the shower to almost the toilet and that would not be good.
Don't see how the use of a linear drain will work properly given my height restrictions without using a curb at the door. Have I missed something here or is there a product that could work within these constraints?