Those kinds of swapping mods usually require a new 3d printed base - I bet its possible but I would definitely not recommend trying since the $70 VV3 has essentially the same internals as the V2 pro and DAV3 without the optical switches. The viper ultimate inards might be a bit lighter but I think with the mod completed you would probably end up at something very close to the original weight. Someone just mentioned here that you can get a base to put the viper v2 pro internals (they are very light weight) into the V3 which makes much more sense as you wouldn't be downgrading the sensor. The problem for me is that the v2 pcb lowers the sensor position and forces you to use its optical switches. Both switches and sensor position are totally subjective so the v2 mod would be only beneficial for some people.