Dig down from a point near x=0, z=0 in the current Nether Hub, down to y=8. (It should only be 5 blocks down.)
* This will need lots of pickaxes - anyone up for repairing diamond tools or providing a lot of iron?
* This may also benefit from a lot of fire resistance potion for occasional dangerous lava pockets - anyone up for some brewing?
Pave the entire 40 x 40 room with smooth stone slabs.
* That's 1,600 smooth stone slabs, or 25 stacks.
** That'll require 800 smooth stone blocks to craft, or 12.5 stacks.
Dig out 10 blocks or so of each of the 8 paths and label them with direction signs.
* North, South, East and West are centred on the relevant 0 co-ordinate, and each are 4 blocks wide.