Took some pictures of the door handle install. The donor handles were very beat up and I wanted something a bit more modern so I got handles from a 2011 RX8.
It is easy to mount these using two screws instead of just one (another reason I was unhappy with the donor's). And the latch pull rod can be used with no modifications beyond bending to adjust the length.
The locking rod is a bit too short, so I welded on an extension.
Here is where things stop being easy... The handle liner is intended to mount into an organically shaped door liner not a flat sheet.
Fortunately, the FFR door liners are thermoplastic. Time for the heat gun.... Many hours later and many trial fit-ups I got something quite nice.
BTW once I countersunk the screws the hold the liner in I found that the screw threads would go through all the material and no long tighten any further (it wasn't striped, the treads stopped slightly before the head of the screw). To fix this I superglued scrap plastic to backside of the liner to give the screws extra material to hold onto.