We can make requests?

I dont want much, probably.
All i want is an embark (6x6 or so) with coal, iron and a river in a non-evil, non-good biome with deep caverns.
By deep caverns i mean layers between z layers. I HATE caverns, not because of the creatures in them but because they RUIN my beautiful, symmetrical, orderly and generally perfect layout.
Currently, i have 25 z layers between the surface and the 1st cavern. If you can have more than 25 layers then, please, do so. I dont know how to manipulate the world gen and if you add too many then the dwarves dont seem to live (i assume they cant find plump helmets or something). I can never seem to find coal or even iron because i guess the game just hates me

Im sick of having fortresses which rely entirely on copper armour and trade so, please, if anyone has something spare share it. (i dont think ive ever seen surface coal, its a legend told to me only through my friends.)
It can be any type of neutral biome, a desert, mountain, tundra, forest or anything. The populations can be anything, i dont care.
Anything beyond iron, coal and a river is a bonus. Im not going to turn around and reject a world with everything and more.
If someone knows what perams i should use to make then then just send those, i can cook some worlds and i know this isnt a very glamorous world.