No worries mate,
Check with advanced transmissions in mitchell i think, we recommend them to alot of people that come into work looking for more intricate trans and gearbox work. They have a pretty good quality of workmanship from what ive seen, and they can be alot cheaper too, which is always good lol.
Why dont you just chuck an rb25 box in? im not sure what complications there are, were putting one in an s14 at work at the moment. Maybe look into that?