I've made various feeders out of buckets or other cylindrical, usually lidded containers, with a buncha 1" holes cut in the sides right down by the bottom and pans of various provenances that are about 3-4" wider than the container popriveted to the bottom of 'em. How big you want your feeder depends pretty totally on how often you want to refill it -- some prefer to refill it more often for hygeine reasons, others prefer to refill it less often for convenience.
The PVC feeders look nice, I may try one next time I have to build a feeder; the wooden trough types you'd want to think about building some sort of anti-roost device to keep poo out of 'em.
I use a 1-gallon waterer for 4 chickens and it holds up pretty well -- I refill it every day or two in summer, less often in winter -- so I'd say for 5 you might want a 2 gallon, possibly a 3 gallon if it's somewhere it won't get too slimy or gucky between being rinsed/refilled.
Both feeder and waterer work best if placed *high*, the height of the chickens' backs, like up on blocks or something. I also put a piece of plywood underneath, with no bedding intentionally on it, which further reduces the amoutn of bedding kicked in and also makes it easier for chickens to find any bits of food they bill out of the feeder.
There are really LOTS of different ways to feed and water chickens that are pretty much equivalently fine, though. (Although also a few Bad Ideas). Plenty to choose from
Have fun,
Pat