1) So if I get say a wire graded to carry 5v+ and 13.2+ amps I could wire all the red ones to it?
You need a wire graded for the amps only, voltage doesn't really factor into the equation, unless your using it for high voltage applications, which doesn't apply here.
For the 5 volt (red) cabling, around 10 AWG will do fine, as 10 AWG roughly equates to 15 amp capacity.
For the ground (black) cabling, around 8 AWG is ok, which has around 25 amps capacity.
For the 3.3 volt (orange) cabling, around 14 AWG will do, as it roughly has a 6 amp capacity.
For the 12 volt (yellow) cabling, around 18 AWG is alright, it has a rough capacity of 2 amps.
For all other wires you can use wire from an old junked ATX power supply.
3) I only have a card reader for my camera the plugs into the slot in a laptop, i'll try to find a picture though
I strongly advise against leaving off the bottom cover of the ROM drive. There are one or two integrated circuits that rely on the cover for heatsinking. Removing the cover will make those IC's overheat and become damaged, thus turning the drive into a fancy paperweight.
I hope the above guides you on the right track.