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[Grax]

Little fortress. Maximum of four map squares - more means A LOT more time to get it done.
Magma pipe and water (aquifer in one-square-nanofortress is the only way).
The most flat terrain recommended.

And two possible ways to do all the work painlessly - iron/bauxite (with goblins or free@smelter) or modded obsidian melting temperature.

1. Build the raising bridges leaving one/two-tile corridor at all the borders - to obsidianize the borders, making them impassable.
2. Bridge up the whole layer some levels higher (with central stairs) to make the water dissipation system (to help in obsidianising-the-borders process)
3. When all the borders are done - we'll get no invaders and won't let anybody get out as only Dtil ;-) can mine out boundary tiles now.
4. Now build the containers for magma (30*30 tiles with 2 z-level height maximum, but even 35*35*1z will be enough)
5. The same container with additional zlevel of height for water with releasing bridges or preconstructed cave-in'ing system (must be independent with magma!)

6. The side view of the project:

wwwwwwwwwwwwwwwww - TWO water levels
---------------------------  - bridge level
mmmmmmmmmmmmmmmmm   - magma level
---------------------------   - bridge level
....................................... - empty level
zzzzzzzzzzzzzzzzzzzzzzzzzzzz - roof bridge level (here will be some floor tiles for material stockpiles)

Somewhere in the center of this will be stairs between isolation walls.
Roof and magma holding bridge must be of magma-proof material, other must be of burning/melting material.

So. Prepare the stockpiles, fill the containers with supposed fluids, deconstruct stairs starting from the top, floor the stair hole in the roof, victimizing the mason dwarf on the top.

And pull the levers.

Obsidianized roof can't be deconstructed.
Obsidianized border tiles can't be mined.

Voila.

[EliDupree]

You can still abandon and then return with a different sized area in order to mine out the walls.

Unless you cast the entire region in obsidian. (and flood the top level with magma if you can't obsidian-ize all of it.)

[Untelligent]

If I remember correctly, when you reclaim, it has to take up the exact area of the abandoned fortress.

[kotekzot]

That's true, but it doesn't matter. The reclamation party will start on top of the obsidian roof, and will be able to dig down. Still, pretty cool.

[EliDupree]

If I remember correctly, when you reclaim, it has to take up the exact area of the abandoned fortress.

What, can't you start a new fort on an overlapping area?

[Retro]

If I remember correctly, when you reclaim, it has to take up the exact area of the abandoned fortress.

What, can't you start a new fort on an overlapping area?

Nope. Reclaims force you to use the exact fort area (no larger nor no smaller) and you can't embark overlapping any other fortress. It might be possible if you switched civilizations using a mod or something, but I've never tried any of those before so I don't know. Just speculation.

[kotekzot]

It's possible with an external program, but leads to bad things happening.

[EliDupree]

I guess the only question left is what happens if you try to reclaim a fort with no walkable ground?

[Grax]

I guess the only question left is what happens if you try to reclaim a fort with no walkable ground?

Dwarves spawns in the upper left corner tile (no matter that material is there), unable to move or do anything.

[EliDupree]

Sweet!

[Grax]

That's true, but it doesn't matter. The reclamation party will start on top of the obsidian roof, and will be able to dig down. Still, pretty cool.

I've researched the scheme to make the current live fortress unreachable from outside, stopping attacks, nobles and immigrants.

But for the case of reclaiming there are three ways to make the fortress site almost unreclaimable:

1. Make the roof out off hatches. They're obsidianizes to stalemate state - becomes non-diggable and non-operating.
2. Make the roof 5+ zlevels higher than ground, so diggers cripple their bones falling.
3. Make the third 2 zlevel height reservoir with magma to fill the most upper layer after water.

[Sizik]

How about a platform atop a single pillar, surrounded by a lake of magma?

Code: [Select]

   _____   
     |     
     |     
     |     
~~~~~|~~~~~
~~~~~|~~~~~
~~~~~|~~~~~
###########
###FORT####
With no way to build down (currently), the reclaim party would be stuck on top with no way down.

[EliDupree]

Bonus points if you put some spike traps linked to a repeater on the platform.