the 'wellycooler' and 2.5'' pipes will be fine on a ko3S.
DV and N75 are down to you really mate, the N75 is dead easy, just using a 6mm brass hose tail with a 1.8th thread drilled and tapped into a pipe and sealed up with chemical metal. the dv take off at 25mm is a bit harder, you can either use a cold side relocation kit, or get someone to weld on a 25mm stub for you.
I've seen people use the original charge pipe turned round and joined with a straight coupler to face up and forward to amtch the wellycooler pipework, I think the stock charge pipe is 54mm, and being directly after the 2'' turbo outlet it shouldn't be a big problem using it for that short length.