added my comments to your list
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Injectors, -What size and where do i get them from (depends on power wanted)
EFI Inlet manifold and plenium - what car does said inlet come from (no such car will have to be custom)
Fuel rail,- again where would i get a fuel rail(as above)
Injection FPR - could i get away with using an adjustable FPR?
Throttle body- what car would i get a decent throttle body from (lots out there but dont go to large)
Better fuel pump, - would a williams fuel pump be suffice?(read injectors but would prob be ok to start with)
Standalone ECU, - Would i be able to get this off EFIparts.co.uk?
this guy is the master talkto him for all your needs
Trigger wheel and as above?
Sensors,..where would i get said sensors
mapping sessions -im guessing rolling road time would be needed with a Mapper
Sorry for all the questions ...im just looking into this at the moment