Hi Rob, that conversion will keep you out of the pub for a while

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Engine loom should not be a problem, if you look at the circuit diagrams you will be able to work out what lives and earths you need. Hook up oil, alt, oil temp and water temp etc for the dash using the mk1 loom. The g60 engine management loom and ecu is not to difficult to fit.
Use the mk1 engine mounts.
What g/box do you plan to use, the 02a is not a straight forward conversion (cable shift, 100mm inner cv joints and the mountings are different.
Is the oil cooler a water housing type one on the filter housing?.
Intercooler, not sure

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Steve.