3s-gte, help with engine decisions Options

[speedy]

Ok guys i have been wanting to do a ST to GT-4 swap. I started reading and researching what i needed for the swap, but there are still a few questions I have. I have seached and these things were not explained to my full understanding.

It sounds like the 3s-gte out of an mr2 sounds like the best way (easiest) to go right?

If i use a 3s-gte motor out of an Mr2 and the tranny w/ LSD, should I use the motor mounts out of a GT-4 or an Mr2?

If I use a LSD tranny from an Mr2 can I still use GT axels? Or should i use something else because of the equal drive shaft length?

Will the ECU from the Mr2 work in the celi or will i have power loss because the computer settings are set up for a much smaller car? Or would this mean that I should get the ECU re-tunned or just get one from a GT-4, which would mean a different harness?

All of these parts would be JDM if it makes a difference

please help i am so close to figuring this all out i think