Tbh if you are having to constantly tinker to keep a 200tdi going, then I kind of reckon you do not know what you are doing, rest of the car maybe, but not the engine.
That welsh guy on tv doing ev conversions, watched a couple of the shows, was not impressed with the mods, mainly as they used the standard transmission locked into one gear, now I am no genius by a long stroke, but I reckon some old worn out pos trans having to handle the low rpm torque from an ev motor is not going to fare well.
This is not the approach they are using for the Defender conversion. It is worth checking out some of the Defender specific films they have done. The engine and gearbox are removed and the brakes etc are uprated to handle the increase in torque. To answer an early comment, you also can avoid an IVA if you don't modify the chassis with new holes/fixtures points.
@george man you'll probably see I'm personally 'invested' in the conversion process, whether foul-hardily or just as part of my mid-life crisis. I'm sure you are going to experience some interesting comments around this 'new' approach to a national icon, but people have been modifying Landies in many ways pretty much since their inception --- many do a fare worse job of being true to the brand and IMHO the new version is just yet another SUV.
I honestly think you, ECC and the other convertors are onto a winner, but for me, if you're asking, the top 4 things would be:
1. Reliability & Longevity (you know it'll work when you start it up and it'll be good for another ~200,000miles),
2. Silent running (I don't need/want the noise or smell from the exhaust),
3. The climate positive impact (retrofitting an existing vehicle, reusing materials from donor EV's and low carbon miles),
4. You only live once, so why not have some fun about it.
We'll see how our conversion goes, but I wish you luck and who knows if/when I have any money again, I would be keen to try and convert a Series in the same way myself one day, so I may be in touch.