Tub Chair (Granton EH5)

Looking for a tub chair in which I will reupholster so appearance doesn’t matter all that much. I’ve recently been lucky enough to have built an art workspace in my home and die to bad health I can’t sit on standard office chairs for too long without developing pain. I’ve attached some photos of tub chairs as a kind of guide to show what style of chair is best suited to me needs. Thank you for reading.