The loom won't go in easily as the bulkhead is different for both fuse box and wiring on the passenger side.

The rear beam, engine and propshaft will go in but you will need to either lose the rear ARB or make up different mounts under the car or on the arms.

Don't know about the gearbox - your 3 dr will have a narrow tunnel and I suspect that the Sapphire will have a wide one. I have an XR4i mount for a narrow tunnel that I can measure if it helps, but no idea if it will work with a T5 box.