From flashlights, no. Just the bodies from the same factory that makes them, with the same equipment, specs and materials.The short answer: no, they are definitely not made from flashlights, at least anymore. The 905 is purpose-built, from the get-go; The SD was originally a modded flashlight, but that changed as soon as it went into mass-production.
I have heard of many people using the SD at 6v also, and as it is a mechanical device and has no circuitry I would wager that it is simpler to mod, if modding is even necessary...I would check the modders' forum or search for "6v screwdriver".
-J4mmin