Do you have to use the solder points at the end of the cthulhu or can i just hook them all up to the screw terminals?
Also im a little confused on which wires from the usb (360 retro) go to the imp and whatnot?
0 0 0 0 0
eg dp dm vcc
meaning under the first 2 solder points it has EG and so forth 
nobody knows? doubt it 
Also what is the adjustable screw at the bottom of the pcb?
The green and White from the x360 pcb goes to the imp. Vcc from imp needs to go to both the Usb parts of the x360 and Cthulhu.
The small holes at the end of the Cthulhu are for piggybacking the x360 pcb. If you read the welcome sheet for the Cthulhu you’d know what they’re for…
If you don’t have experience with soldering or electronics I’m not sure why you’re trying to tackle a dual mod…
Ground (black) on 360 goes to ground on imp
VCC (red) on 360 pcb goes to VCC on imp
D- (white) on 360 goes to D-2 on imp
D+ (green) on 360 goes to D+2 on imp.
Use USB on imp for usb out to system.
When successfully dual modded you will need to hold down Guide for 360.
This might be helpful but the RJ-45 stuff is not needed.
http://www.shoryuken.com/showthread.php?t=225565
I was just wondering. Its not a tough job to do. Just had to say yes or no And thx rtdzign, but i did want to use it on a Wii/gamecube system too.