What to do with electronics for powertrain swap

I have a 2012 Ford Fusion with doodiety transmission. I plan to find a 2012 or 2013 Mazdaspeed3 as donor car and swap in the whole powertrain. Since they are both FWD, and a similar powertrain in MS3 was used in MS6 which shares the same platform with Fusion, there shouldn't be many mechanical problems.

People say the integration of the electronics is the difficult part. I think only the parts that receives inputs from powertrain need to be from donor car. The infotainment system, lights, air bags, etc, should be able to be controlled with SJB of Fusion. My question is which parts of electronics must be from donor car? Should gauge cluster, ignition switch, ABS, traction control be from the donor car?

Isn't worth while!
Engine and gear box controllers, sensors, plus because of slightly different CAN and LIN systems all the software codes might have to be changed.
I have a 2010 Focus PTS, the 2011 has completely different electrics.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

What about swapping a manual transmission from Mazda 6 with the same engine?

I checked the A65M-R transmission that I might be using, and I only found three connectors, neutral and reverse switches and a speed sensor. I am not sure if the speed sensor from Mazda is compatible with fusion, but the wires of neutral and reverse switches can be used as inputs to replace those from shifter of automatic transmission.

Besides that, it may be as simple as just grounding the park wire of the automatic shifter, so that you can start the car. I don't think it's necessary to change gauge cluster. Because I have remote starter on my car, I think it's better to design a circuit that park wire is only grounded when the manual shifter is in neutral and parking brake is engaged. To make "D" of the gauge work, a circuit can be designed to energize the wire when the shifter is not in reverse or neutral. This way the only thing that doesn't work on the gauge cluster is the "M" or "L".

I am not sure if cruise control will work though. I think it's possible that it will work, but gears need to be manually changed when the RPM is not in desired range. The other concern is whether the PCM will still try to compare information about RPMs, speed, gears, and go nuts when the combination is not what it expects. Even if that is the case, a tuner may solve the problem easily.

Did I miss anything?