O'Cello - Cello Edge

I wanted to give the O'Cello more of a cello shape, so i came up with this. its loosely based of the yamaha cello shape.i used autocad to design this.

Pleas feel free to edit the parts make them better.

you may need to use a 2mm drill bit to drill holes for "center part B".

Parts:
4 - M4x25
3 - M4x30
5 - M4x20
1 - M5x50
7 - Self tap screws
1 - M5 Nut
12 - M4 Nut