Yeah I don't know if I would go with 5 projectors. If you had room for a rear projection setup perhaps. I was thinking for the day trader if he can pony up for a 4K projector just the one 4096*2048 expanse might be enough.
I was designing a control room for a datacenter, went with ten 52" Sharp Aquos', in a 5 screen wide by 2 high grid. Major systems were monitored there. You could sit back and see the wall of screens. Drop your eyes a tad and you were looking at the local screens, for detail work. Each operator had a pair of 27" screens in front of them, had to use some custom PC/controller doodad to have the video wall seamless and accessible by any operator. No pics unfortunately but the room was wide enough and not too deep.
Did work with the manufacturer of the furniture in the design, making sure the angles worked in terms of visuals. End result, the operators were happy. And we have a shiny showcase for the higher ups that approved the funding.