don't forget that most servers want an off-switch for redstone, so you'll need to hook up the clock for that generator so that it's got one.

You could also get creative with some rails and chest carts to make a vertically rotating storage option.

Cobblestone Generator and Tnt Trapped Bridge. (Self Buildingi Bridge)
Just create some cobblestone generators facing were the bridge would be
using pistons to direct the flow of cobblestone to where your bridge is
using "cleverly hidden" tnt traps to blow up the bridge and it should repair itself.

lava. does the job...

chickenfarm?

you can use a train of course,
A boat track
ender pearl track
slimeblock engine
human tnt cannon
slimeblock machines (slime block launcher)