I do not typically offer our mods as a kit.
The reason for this is because we have to machine the enclosure to mount the transformers and PCBs as well as the cover to allow the tubes to be exposed and vent heat.
Also, the interface of our circuits with stock involves removal of surface mount parts and a mistake by the DIYer would render the unit inoperable.
I have decided that the mod will include two new transformers, one for analog one for digital, to replace power from the switching supply to the audio circuitry. Depending on the current draw from the SMPS, I will not likely replace it outright, but rather let the switcher still power the processors, etc. All audio circuitry will be powered from our own linear supply however.
I have a plan for the output stage, tubed, transformer coupled. I am finalizing this still because I want to keep the XLR and RCA outputs. Lundahl transformers are expensive and the use of four of them like we did in the Oppo mods will increase the price.