I had a go at replicating Eloraam's turtle army concept in Tekkit, but as there's no ability to interact with inventories I could only do the bit where you had a master turtle spawning and instructing slave turtles, along with navigation code so that they could be directed to specific location and direction vectors, along with code to calculate those target destinations. Basically spawning a turtle that runs a program to listen out for instructions is actually pretty trivial.
My system, because a quarry was impractical, was a sugar cane farm where turtles were launched, sent to a specific row to harvest, then they all would deposit their goods in a transposer, then return to the master turtle to be destroyed and stored until needed again. Nothing was hardcoded except the location of the top left of the sugar cane farm, how big it was and which direction the rows of cane went in. Very fun project.
The only problem with doing the full mining turtle army quarry in FTB is that you'd need 2 ender chests (one for output, one for fuel) per turtle along with 3 diamonds per mining turtle, so 60 of them would be ridiculously expensive!
As for the original post, I think it's doable but very, very ambitious. Scary, scary coding required.