there are no guides, you just have to take a bit from different guides.
what you are trying to do
i recently did this mod, it’s not too bad. the unnerving part is cutting the usb cable from the TE pcb
if you use the madcatz sf4 fightpad you don’t need the resistors / inverter.
what you are trying to do is attach the signal on each PCB to the buttons. This goes for all buttons including the guide (which is the only one not easily accessible). The TE’s PCB is already wired up to the buttons so you really only need to solder the signals on the 360 PCB to the signal wire of the button (the top row). To have guide functionality you need to connect the PS3 button and the guide button signals together. the last thing to do is just follow the directions on the imp. connect the outgoing USB cable to the top, wire both the grounds to the imp, wire the power to both PCBs, wire the signal cables and you’re done.