> Aren't the BMW engines rather heavy?
I don't really know.The engine is still in the donor car. I haven't had much time to do any work on the roadster for the last 12 months except for adding adding a BMW steering rack to the chassis.

> And tall?
The engine is mounted slanted in the car/chassis so I hope it will be ok.

>Why are the brake discs painted black in the above photos?
>Temporary rust prevention.. I hope.
The brake discs has a protective coating and are from MTEC Brakes in UK

It is pretty tall, a friend of mine fit a 318is engine, it's a challenge to fit it under the Equinox bonnet line.
https://goo.gl/photos/aPQXRW7KngXxZ88a8
https://goo.gl/photos/Lkp82KgaxL7W6GLw9