oil cooler pipes are worth getting made, you got an agri engineer up near you? they should do it cheep nuff.
if your handy with a welder just make the down pipe with sections from the old down pipe and the disco jobby, thats what i did with mine, took couple of hours but works fine.
intercooler hoses are worth getting, i did my own and it was a bit of a faf tbh.
just noticed your only up the road from me, if you want to double check anything against mine your more than welcome fella.