FT-Warp point/asteroid forts

Here's a quick idea I had for building a tough asteroid fort for use in
warp 
point defenses. This is very much a work in progress at the moment, so
any 
criticism is OK. :-)

1- chose the mass of the asteroid (e.g.-1000 mass)
2-Chose the mass of the facilities to be built inside the asteroid
(basic 
hull e.g.-200)
Chose how far inside the asteroid these bits will be buried (or how many

layers of armour, as in PH layered armour).

A asteroid gains it`s armour for free from the rock it is buried inside,
but 
the deeper it`s buried, the more it costs. For every level of armour,
the 
base cost of the hull is +x1 (ie- a 4 level armour has a base cost of
x6). 
Using rock does have the disadvantage of that the rock itself isn`t as
good 
as man made armour, so you only get 50% of the armour value of the rock
(in 
the example i started with, that means a 1000 mass asteroid with a 200
mass 
construction inside has only(!) 400 armour).

Next you need to add a station keeping drive and power plant. For these
I 
use a mass of 2% of the TOTAL asteroid (e.g.- 20 mass), but this comes
from 
the total of the interior construction. For shields, the TOTAL mass of
the 
asteroid is used again (at normal rates, so for the example above, it
would 
require a mass of 100 for a level 2 shield).

If you look at the example above I have been hinting at, you would have
a 
asteroid fort of a mass of 1000, with 400 armour points in 4 levels,
with a 
level 2 shield, costing 940 point without weapons and only 80 mass left
free 
for weapons. Items like shields/weapons etc are all normal cost/mass, 
because you have already paid for the cost of burying them.

BIF