There's a good idea. GROW the beanstalk yourself, with some very expensive beans that you have to buy from the elven caravan (of course). The beanstalk must have an empty tile over it, so that you can grow them instead of stairs. Then your dwarves get happy thoughts from growing a beanstalk maintained by your skilled farmers.
Fort in a giant living tree? Sweet!
*gasp*
Ye are not a dwarf!
Ye are an elf!
Get him!
But serriously.
I definitly like the idea of being able to pick and chooze the axis's
Like for one map you may want it to be only 2 tiles across in world map and 5 tiles down in worl map, then have it five tiles up from the ground on world map and 0 tiles underground, if you get what i mean.
Just being able to add the ability to choose which z-levels you have and to the extent that they go would be freaking great.
Forget about my last idea, the beanstalk should NOT support the sky-borne land-mass. Floating lands need to levitate on their own magical power. Beanstalk should also be good for finding underground river and pools, as that would be where they naturally grow over. An expert woodcutter will cut down through the beanstalk roots like a miner till he reaches your new source of water.
Yeah they should float or levitate on their own or by sky pillars.
Beanstalks could be classed as a somewhat limited aquifier, or just have filled in the middle of it...
e.g
=
===
==7==
===
=
= is beanstalk wall
7 is water tile
and constantly having it upwards.
Could be like a water pipe, xpt in beanstalk form