Nice job. Love the music reference. I love the Gattlings on the sides. I do find that, for the middle of it, if you just use those 1x4 pieces with SNOT studs on the sides for 4 corners, and then use some 1x2 with pin holes, put pins with studs on one end in those, and use those for the top and bottom. It is not easy to explain, but it is way more simple.
Andante is my favorite of all your Black Fantasy creations. The shape is perfect, the legs are creepy and the weapons compliment the deadly appearance. For some reason, it reminds me of a Shoggoth. This is clearly a work of art.
The shape is very flowing and organic. No complaints there. It looks kind of like the things from that recent Chicken Little movie. I like how it's named after a musical tempo. The legs kind of look like the plugs for amplifiers that go into electric guitars.