Mine is a road rally car complying to RR regs too. It only has a half cage, not a full one like yours, it is however a 4 door car! It was wearing a set of 175 50 13 semi slicks on 13" alloys but my spare is a 185 13 gravel tyre on a steel rim. My sumpguard wasn't fitted at the time, nor were my gravel tyres (which I expect to be heavier.) With less than 10 litre of fuel in the tank I weighed in at 820kg.
There is 5kg of steel in the back seat backrest that can go, then the carpet under and behind the seats, my parcel shelf and support platics aren't there, lets hope a scrut doesn't notice ;-) Glovebox isn't there either. There are 2 towing eye type brackets bolted just inboard of the front wheels near the front bumper. I think there may be benefits in removing the fan blower and ducting to replace it with a 12v hairdryer/fanheater duck taped into the screen duct as a demister. Then there's the Varley red top battery and the polycaronate windows route but it all takes money. I like what you done to the doors there etc but at the end of the day one bad call from a navigator will negate it all eh?!
It took a while but there you go, you got what you wanted, a weight comparison to another Road Rally Micra.
