I just finished installing my SVO conversion this weekend. I purchased the how to files from Dana for the heating units and the HOH. Overall very good probably saved me a lot of time scrounging for parts. I spent about $300 for my system including the $50 for the plans. I bought all parts new. This doesn't include the preheater using a glow plug yet(I will add later if I want to switch over faster.
If he makes a kit for ~$400 i would go for it in a second. I spent probably 20 hours to collect build and install mine. Install time would be about 8hrs or less. Much less if you had done it before. I learned a lot and am cheap but for $100 it's not worth the extra hassle of running all over hell and back finding parts etc.
It works great!!! BTW if you are doing your own don't use lead free solder. Go with the actid core lead compound.......If I had known the difference it would have saved me four hours of frustration.
Dana's how to files are worth the money.
Stephen