slim - I don't think that shops like I-Speed or Lachute really want to give away their "secrets" when it comes to a step by step to doing the swap. They've invested ALOT
of time, money, sweat and tears into perfecting techniques and I think it's fair for them and others like them to keep these methods to themselves to put food on the table.
Also, wiring looms can change at a whim with auto manufacturers. I know this first hand dealing with Ford Motor and their MCR (Material Cost Reduction) programs. I'd assume that Subaru follows a similar practice of trying to cut costs and stay competitive.
Just my 0.02 (adjusted for my honourary Canadian citizenship.