Okay, I didn't really explain the MFFS very well in the video. The 4 MFFS machines that you need for this setup are the MFFS Force Energy Extractor, the Projector, the Capacitor, and the Security station. You will also need an MFFS Multitool/Omnitool, some Forcicium (macerated Monazit). Finally, you have to have a source of power for the Extractor. In the video I used a potential bug with the MFFS FS -> EU Converter, but you could easily power the extractor with solar panels, generators, etc. as long as you don't run out of power while there is a Wither. You will also need a handful of blank access cards, and I'll talk about the projector upgrades later.
First, set up the MFFS blocks similar to how I have them in the video. The only important positions for the blocks are the Projector being right in front of the turtle, and the Capacitor has to be within 8 blocks of all the other blocks, otherwise you can put the blocks wherever you want (in the video, the capacitor is underneath the turtle). Next, you take 2 blank cards, right-click the capacitor with both, and then right click the extractor and projector with the newly defined cards. This connects all the blocks into a closed FE power system. Then, you take the multitool while you have another blank card in your inventory, set the multitool to the mode with a few horizontal lines as the icon by shift+clicking it, and then right-click with the tool. This will turn the blank card into a security card which should show your name when you mouse-over it. Open the Security station and put your security card in the master slot. Lastly, you take another blank card, right-click the security station, and then right-click the newly generated red/black/yellow card into the projector.
Of course, that is all quite tricky to follow, so do it in creative singleplayer first.
As for the upgrades used in the Projector, all of the names are so confusing, you will literally just have to pause the video on the screen where I open the projector, and take a look at it. The 4 upgrades in a "plus" sign increase the size of the forcefield. This is necessary because if the Wither's head is stuck inside a block, he will fly up until he is free. The two upgrades below those 4 (purple/green) increase the height (4x) and the strength (1x). By strength, I mean it makes the forcefield 1-block thick, by default it is only one paper-thin side of a block. The thickness is important to stop splash damage from the withers attacks hitting things outside the wall. The last upgrade in the bottom slot (with a creeper face) is the NPC-Defence upgrade which periodically does damage to any Non-Player Characters inside the forcefield.
Test it in singleplayer. I promise 99% of people who try to use the MFFS Mod will be as confused as I was. Worst case scenario just pause the video and copy it exactly from how I did it. Don't hesitate to ask more questions I can try to answer, it is better than thinking you know, putting it in a multiplayer server, and killing everyone. =)[DOUBLEPOST=1357942406][/DOUBLEPOST]OH I forgot to mention, you almost definately need 19 Extractor upgrades (the maximum allowed for the slot). This helps the Extractor produce force energy at a much faster rate, but it will also guzzle EU in the process, so you need a decent power supply. The better your power supply, the less time you have to wait in between Withers while the capacitor recharges.
Having the 9 (max) upgrades in the capacitor is a nice bonus in case for some reason your power fails, the capacitor has enough energy to complete an entire wither kill.
