Curtains in model homes are usually custom.

Yes, you can. I bought the 100% polyester fabric shower curtain liners from Superstore and they are still perfect five seasons later. Mine are light grey so the don't look dirty. I throw them in the washer once or twice a season to freshen them up. Keep in mind that they are super light weight so you will need a method to weight them or tie them down. For me it was easy, I just binder clips them to my  cable deck railing. Since they are polyester, they have never gotten moldy or mildewed - but I am in a low humidity province.

Which one do you prefer to hang your curtains? Single style Double style Here is a curtain rod shopping guide!

To train my drapes (which I make myself) I hang them up, open the drapes all the way over to the side. Then I staple strips of paper (about 3-4” wide) around the pleats after I’ve got them hanging how I want them, in about 5 places down the length of the drapes and leave them there for 4-5 days. I always line my curtains and use weights (or slip a coin into the bottom corners). I also use buckram (encased) at the top to give some stability before they are pleated. . The curtains are ironed throughout the process, but the pleats are not ironed (after they’ve been pleated). I use a pleat calculator to determine how many pleats I need. I always use 2 1/2 x the width of the window for fabric fullness. I use the long hooks (2 1/2”? ..it’s been a while) which gives structure to the pleat heading (but it depends on how ”deep” your header is). I also make them so they overlap in the middle, which requires a special overlap type of “ring” - can’t remember the name. Your drapes look nice !