Q: How much scrap do you get every minute?
I made one that does 25 every minute (it did 125 in 5 minutes, timed with a timer on 300 sec and a tflipflop) (total size: 9*11*5 (lenght*with*height)(control panel excluded)) with tekkit 3 .
We are making 2000..3000 scrap per min. Thanks to GregTech. We use Electric Rock Breakers to make cobble which is transported to 128 highly-overclocked Recyclers by using Pneumatic Tubes. Scrap is crafted to boxes with Electric Crafting Tables. Scrapboxes are opened in Scrapboxinators.
Using pipes to transport thousands and thousands of blocks of cobble makes factory area extremely laggy. Because of that we are making some massive changes.
Every breaker puts its cobble to Automatic Recycler which puts scrap to buffers which move it to craft table to craft boxes. This is the first place where pipes are used. Pipes transport boxes to boxinators.
Reduce in lag is amazing. Still waiting for opportunity to overclock auto-recyclers to make as nice output as earlies.
Everything is 100% legit. Building has taken huge amounts of resources but factory gives them back. And even more. 
Mods used: IndustrialCraft2, GregTech, RedPower.