No i havn´t talked in that Video, it´s still hard to walk free so it was a more save Feeling for me (don´t do to many things at the same time).
Just with some tape for the pic. If ... i would Mount it by using the handguard hole in front of the TMC Frame need to build an Adapter, front(Barrel) mounting will be to pieces of ... screwed together. The under arm Thing should be mounted Closer to tank too.