From (my bad) memory: he first made single level high power drivers. I think they were 1.5 watts. Then he offered it for the L0P (AAA light). Then he offered the L0P with 2 or 3 brightness levels and two power levels (1.5 or 0.75 watts). I bought one of his first 3-level L0Ps (0.75 watts) and still use it every day. Later he started selling modified Arc AAA's, single and two-level I think.
His only current project is the Arc AAA with a Cree LED. These is a signup list on CPF but he has been delayed due to moving, changing jobs, having a baby and renovating his house.
I don't believe he has sold his mods for multi-cell lights. Just 1AA and 1AAA ones.
Sorry for any inaccuracies. I was waiting for someone else to answer but jumped in when I saw 0 replies today.
Cheers - Greg