Yea, it is bulky, but as he said in the construction video it pretty much is what the Proto-Sabers were like in the Old Expanded Universe.
Hi there, the Proto-Sabers were bulky and had a back-pack to carry the power cells. This made them vulnerable though as many times the connecting power supply
cable would get severed rendering the saber useless.
Back in the real world (well on the Internet) there has been a lot of discussion on social media as to whether this is a "real" saber or not. Other descriptions have ranged from a blowtorch all the way through to a jet engine! Whatever it technically is, it is impressive.