Hi, I've been lurking for a long time. Since we just finished the bathroom remodel I thought I'd come out and say Hey! I'm sure I can't post links yet but maybe I can point you in the right direction for something helpful. We went with the prefabricated shower unit that has the roll-over rubber gasket to keep water in. The unexpected bonus from that gasket is that you can roll over it just to execute a turn so the shower can act as part of the 5' turning radius. Our bathroom is 9x9. The shower is 4x6. Extra large center drain. I don't regret going with the prefab. The quality is nice and it saved us having to rip out the floor and subfloor to get the slope for the drain. Those gaskets are ingenious. A Tornado dryer mounted in the corner of the shower, a wall mounted sink, and a bidet. After living with it for a month we've decided to widen the door to 36", and add some floating shelves around the sink to keep the floor clear. They took everything down to the studs, and we had to relocate every single drain, toilet included. And it ended up costing about $14k. My husband is over 65 so the AGI for us is 7.5. We missed it last year but I don't think that'll happen again. When im able to post pics I will, or if you have questions! I'll do my best. The prefab is from Best Bath Systems. You can order a kit that comes complete with sliding rail shower kit, fold up seat, rod, curtain, rings, and 3 safety grab bars. It has built in ledges for shampoo, soap, etc. I hope someone finds this useful.