The Luxury of made to measure bespoke furniture is you get to choose exactly what you would like your sofa be from fabric, colour, type of cushion filling to the exact dimensions you require. I also think the other advantage is you can also custom the sofa to fit the space in which it sits to maximise space. I would in my experience say that if you prepared to pay a certain amount for a sofa that there isn't that much in the overall cost but find that you may actually get a bit more for your money for instance a lovely feather foam wrapped cushion against a hallow fibre dacron seat cushion, sprung seat section instead of webbing that kind of thing. If you find a style why not ask for a comparison cost you maybe pleasantly surprised. My only real advise would be to make a full list of specifications for your upholsterer to work to such as how soft you would like the seat so he has some clear guidelines.

If you both like to lie on the sofa then definitely go for a corner or a corner-chaise. It may not look as open/spacious, but you've got to strike the balance between looks and how you like to live. If you can't enjoy relaxing on the sofa then it defeats the point as you just won't use it. We had an amazingly comfy corner sofa which we (and our guests) loved but we had to change it to a 3 seater when we moved house and it just wasn't right for our room. I miss it so much and next time we buy a sofa I will absolutely be buying a corner or a corner-chaise. We like to lie on the sofa too and the 3 seater that we have is way too cramped.

would be careful about the type of leather, as there are different treatments which applied and can make a difference to longevity. we bought analine leather couch, very expensive but didn't know that although soft and comfortable it didn't take too well to every day use and hot body! it was our only couch and we had a his and hers side.......his side the leather darkened and after 5-7 years cracked, now ripped. only resolution, cotton blanket over the seat and back cushions. Recovering both seat and back cushions will be as expensive as buying again.... 3 years after quote we are no closer to deciding as it is a damned comfy couch and styles have moved away from classic to stiff and angular! Hint - do some reading on the leather types....

I think you could go various ways. I like the rug, can it go under the sofa feet? (Hard to tell how wide it is from the photo). The art seems a bit small, it often works better if it's hung just a few inches over the sofa to connect with it. I'm not sure if this art is big enough though as 4 seater sofa sizes vary. I'd probably repeat the brass for a coffee table or floor lamp and then I've picked up colours in the art for cushions but maybe vary the texture with linen etc rather than just all velvet. I think it will look great once furnished and accessorised 😊