Thanks for the positive feedback, appreciated.
My battery is disconnected unless the car is in use, as I have a power drain to be identified that burned through a brand new battery in just 3 days.
No SRS/Airbag issues following install of harness. Seats I left connected in wiring, only had to remove enough to be able to move and access side bolt for belt.
My steering wheel and airbag removal obviously caused a dash light, however the resistor that comes with the Momo hub boss cures that once installed.
I hadn't even realised that about the passenger seat, never been over that side or checked - thanks for the headsup.