its not cup racer spec is it....its got fibre glass doors and different suspension and brakes and the body shell has propbaly had all the unwanted brackets removed etc
According to renaultsport site clio cup racers are 1060kg.
A weld in cage in T45 would save a good 25/30kg.
I bet the standard doors weigh a good bit, the doors on my alfa weigh 45kg each with the safety bars in place and they are a 15/16 year old design for 15/16 year old safety/crash tests.