Just looked at your project, looks very interesting..... I might look at something along those lines for my next project. My only worry is getting it registered in SA. Might be easier to get an old SA registered clubman and renovate in this State??
PS I have a friend that is in the process of building a Birkin PRB S3 Clubman, a few of them in SA now….
Have you seen this article – the old battery dilemma again!