Awesome write up mate.
I have a feeling I know what the bulk of your issues were though, I have seen those Autobahn88 kits, they are copied directly off the Greddy version, and Autobahn88 only makes them for R33/R34 GTR, so if you were sold one for R32 GTR, I reckon thats a big part of your problem as they are very different.
Nick