Put the tv in front of the rear windows. Put the 2 seater in the middle of the room facing tv near fireplace. Coffee table between tv and two seater. leave the 3 seater on the same wall but closer to pianos current position. Put piano in suggested position. As for the bay windows a nice small round table with two chairs. A place to sit and have a drink and listen to music and look out the window...adds intimacy.

So I think we have decided to stick with the layout that we have and just block up the double doors. I hope it and it will be nice because I have lost a lot of sleep worrying about it. Thanks for letting me post here.

We will have oak trusses also. I want to have a lot of natural materials inside.

I think introducing an angled wall will not give you anything other than something a bit different. We have this in our house and it is difficult re positioning of furniture etc. You are also limiting what you can do it the kitchen, ie removing a wall of presses or increasing the cost of having custom made to fit! You have lots of space so I would leave that as it is. I dont know if you have kids, but think about how you will use this open plan space as they get older and you need more privacy! In relation to upstairs I like the idea of the Jack and jill but prefer the layout of the master bedrooms in the original. That is a really big dressing room compared to the size of the bedroom, but if this is what you wanted go for it!