I don't think there is any rule that you have to use leather if you don't like it. I also opted not to use leather in my formal LR and think it would look out of place and just have a leather ottoman in my FR. When choosing fabrics you need to consider very carefully all of the textiles and patterns you plan to use. The most often used rule of thumb I've heard is to start with the rug and build a room around that. Whether you choose a sisal, oriental rug or none at all will have a huge impact since it takes more area than anything except the walls. I learned the hard way and did it the opposite and it became very challenging to find a rug to pull together all of my textiles. You need to also consider any WTs you may want. If you choose something like shutters or woven wood that will add another textured non-fabric element to your palate. Another consideration is using decorative pillows. I prefer sofas to be in more of a solid/neutral so that I can create different looks through the use of pillows and/or thows. That way you can work in some more expensive designer fabrics into your room without breaking the bank and since a sofa is a more significant, long term investment, you do not lock yourself into one decorating option. My sofa has a subtle herringbone pattern to it in a shade of creme. My sectional in my FR is a moss microshade.

These days, Stickley is considered top of the line in quality. The brand carries far more than the mission style furniture they were originally known for.

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That TV is so high up that I think you'll find it very uncomfortable. Ideally, you should be able to look at the TV straight on without tilting your head up or down (otherwise, you can cause major neck issues down the road). Would you be open to putting your TV where that mirrored cabinet currently is? That way, you could lay out your couch and chairs basically the same way it's done in these photos above.