"Upon questioning this morning he said he'd install a liner if we want but it's not necessary due to red guard and tiled floor, which I find hard to believe. There was also no talk of flood/shower testing." RED FLAG. It is necessary. All showers require a pre-slope of 1/4" per foot. "My biggest concern as you will see in the images is around the shower drain the hole in subfloor is not even sealed properly and I can clearly see into crawlspace. He said he was going to add some wood support from under via crawlspace and then seal all the corners/gaps we see in shower floor by thinset/cement." RED FLAG - this should have been done first. Then the pre-slope. Then the liner. Then the water or leak test. Then the mud bed. Then tile and grout. I'll repeat my advice. I would prepare a new pre-slope tile prep stage with 3701 and a NobleFlex Flashing. Let it cure a week. Then re-apply Redgard over the flashing and up the walls and curb. I would like to see the reinforcing mesh used at all changes in plane. My private photo bucket albums have hundreds of pictures showcasing various waterproofing steps. A liquid waterproofing shower floors is not my favourite approach but with time for curing and proper coverage it can be done. Here is an example of a NobleFLex Flashing (Divot Style) shower pan being built. This shower was later waterproofed with Aqua Defence. The NobleFlex Flashing is showing with the grey colour. In this picture the top collar of the clamping drain is not set. This shower is a large wet room with multiple grading changes.

Don't have the contractor round the edge of the tile. It will look nasty. Besides the wood option, you could purchase a tile molding edge in a complimentary color to your tile, even though the tile itself doesn't have such a thing. See Houzz photos under "tile edge trim" for an idea of what I mean.

@jennifer hulse design - sorry for the confusion. The top photo is of the tile elements that were delivered, all for one bathroom. The floor tile is a lot more off-white/beige than the store sample was - the store sample was a creamy white with gray. So I'm not happy with it. As you say, keep beige with beige, and gray with gray. The delivered floor tile doesn't have any gray in it. So for the second photo, I swapped out the floor tile that I don't like, to see how a gray tile (which happens to be what we ordered for another bathroom) would look. Of the two options, I think the gray floor tile goes better with the silver gray baseboard tile, etc. I'm actually okay with the wall tile being slightly whiter (and less gray) than the sample, for several reasons. 1 - the wall tile will only be in the combination shower/tub alcove. 2 - it allows the accent tile to stand out. 3 - it's neutral, and with all of the other elements, gives a little bit of relief to the eye. It may be worth it for me to go back to the tile store and look at other gray floor tiles, but I'm not sure if I'll find something I like better. There is a floor tile that matches the baseboard tile, but I'm not sure I can accept the level of variation that might exist in the floor tile (based on the level of variation in the baseboard tile that was delivered).

This looks great!