EVTV have posted a 5-series conversion:
https://www.google.com/search?q=Dami...bmw+conversion
They have also shown a 2:1 planetary-gear reduction box that can replace the transmission and clutch; but I don't have a direct link, so [citation needed]. Depending on the rear axle gearing, you get a gear reduction similar to Tesla or Toyota HSD (7-9:1). Your motor [might/will] shred the BMW transmission.