[Rossba]

We basically just followed the engineer. We had issues with the seat belt height from the base of the seat and had to make brackets to lift them higher. Looked absolutely stupid and couldn't see them being safe in a accident. Noise test was another issue with 2 cats and 4 mufflers we were 1 db over the limit. The engineer let it pass.Brake rotors had to have the minimum thickness stamped on them.
Try to use as many parts from donor cars that are already ADR compliant and give the list to the engineer when he asks.
Basically it appears that it is up to the engineer's interpretation and it is he who you have to satisfy.
We had a plywood dash in bud had the crash pad on the edge of the fibreglass. We had to have a heater de mister onto the windscreen. Seem's weird for a car with no roof but I think thats what the ADR's require and probably does't cater/allow for cars with no roof.
Had trouble finding ADR seats that would fit. There are plenty of ADR seats that are to wide.
Enjoy the build

Ross