1. I did my own conversion.
2. I spent a lot of time converting my van. If I had spent the time working, instead of converting the van, I would probably have a more valuable vehicle. However, my van is very custom made to my requirements, and I had a great time doing it.
3. Thousands are converted every year, lots of people are doing it. From simple vehicles to professional quality conversions.
4. Designing the interior. I had to fit a lot in, but I did it.
5. A DIY conversion never has as much value as a professional conversion. But it will save you a lot of money initially.