When I do electronics work I usually sit at a bench on a stool. I use a computer, solder, draw etc.
At home, I also use a swiss ball instead of a chair.
The modern office chair is a bit of strangeness if you think about it. They aren't always that great for your spine either. But I've got a few ridiculously comfortable examples and I'd not part with them. You know you've got a bad chair when you get up and you're sore.
Mix it up. And try not to sit for more than two hours without a break. I'm not even sure we should be sitting for more than an hour at a desk come to think about it. But we probably all have. Flow is like that.