I'd skip the rear main if it is good. I didn't change it on my '15 10K Fusion that i swapped in my former '04MZ3. It was fine. I used Toyota oil pan, cam housing FIPG to seal the engine. I used it for 17 1/2 years at a Toyota dealership. Bulletproof. Hope the swap goes well and I'm impressed with the purchase price for everything. Sweet. Just sharing my experience.
I got a deal on the parts for sure! I'm lucky that I live in an area where we have lots of yards to choose from. I used car-part.com to find a yard near me that had the engine, IM, and TB that I wanted. As an added bonus I could see pictures of the actual car so I knew that it hadn't been in an front-end collision. When I went to the yard they were pretty excited to hear what I was doing with this swap so they cut me pretty big breaks on the Mazda IM and TB. The engine itself was only $350!
Your thread is definitely one of the ones I'm referring to. I really appreciate all the steps you documented to get one of the newer 2.5's to work!