You don't really need anything except wire cutters to put the kit together, and yeah, those are the original colors.
Though they'd look a lot better if painted. The lancelot's picture is kinda messy, but you can see how the guren feels so plastic-y.
Also the instructions are lego-like instructions, very simple and straight forward.
My guren in the making (Upper body ready for priming after sanding and putty):