I'm not a fan of SRPP driver circuits much. I would look at Bottlehead personally as Paul Joppa is an excellent designer at similar price points to the Oddwatt designs. There is also Transcendent, Audionote ($$$), etc....see the Lab forum here for details (section on diy kits and resources).
Honestly without a basic schematic and detailed measurements it is hard to tell if they (the Oddwatt kits) are worth it. Remember the devil is in the details, and I've become somewhat skeptical of rehashing and recycling older tube circuits.
I wish them well though, as I know it's 2 diyers who are just trying to support the tube community. Maybe somebody here will build them and/or measure them plus report back.
Best,
Anand.