This instance, I'm going quarry-less and using Turtles with my own code. It took several hours of debugging and optimization, but the finished product is nice. With just 1 Mining Turtle, a few stacks of charcoal for power, and a couple of chests and some piping (void pipe filtering cobble, dirt, and gravel), I can set it up to do 64x64 (or larger) starting at exactly the layer I want. My current turtle is at height 15, for instance. The last 64x64x15 quarry he did produced a good amount of diamond, gold, and other useful ores. He doesn't quire wireless for GPS and instead tries very hard to go where he's supposed to go.
Gravel/sand were a challenge to figure out as was water. The final challenge was gravel/sand with water on top.
If I hadn't have been a coder in a previous career, I would have no problems downloading someone else's public Turtle quarry code, but finding an excuse to do coding again has been fun.
The current version of my quarry code is here:
http://pastebin.com/hejgCauq
ex:
1. Place facing the direction you want him to quarry. He will quarry a 3D area ahead, to his right, and down to bedrock
2. Place his drop-chest immediately on his left side with whatever piping/filter/Tesseracts you want
3. Load charcoal (4 to 10 stacks is usually enough), download program, and run it
4. Place chunk loader if you're going to be out of the area for a while
> refuel all
> pastebin get hejgCauq quarry
> quarry 64 64
If you aren't sure if you have enough charcoal or other turtle solid fuel, place a chest behind him with only fuel in it. He will refuel from that as necessary when he comes back to unload his inventory.
Just remember to plop down a Chunk Loader if you're leaving the area !
The last few quarries have been bug-free and very efficient in terms of energy usage and resources gathered. Late-game, I will do a mining laser, but for only 3 diamonds for the pick-axe and very little charcoal used, a mining turtle is hard to beat for early-game efficiency. Just this 1 little turtle has kept me supplied with most everything I need at the rate I need it.
I use another turtle as my "mining buddy" when I gather Obsidian. I dump water over lava and tell him to gather a rectangle or line of Obsidian while I gather other stuff in the immediate area. The simpler line and rectangle Lua code is here:
Line :
http://pastebin.com/Pz4CJxZt
Rectangle :
http://pastebin.com/ZrEpQW7z
Up next are simple programs to build stairs down to bedrock, laying proper stairs along the way and putting up torches for lighting. Using the equation for the surface of a sphere should be fun as well to help build a dome. A glass dome over my tree farm or Thaum + Pure Node has a certain appeal.