Frame with 450mm wide.
Motors mount 16mm/19mm.
Easy to print.
You can help me to do more things like this.
Buy my designs at pinshape:http://pinshape.com/users/27920-jsirgado
The OpenSCAD file is there, you can change all.
Use 4mm diameter screws to hold all together.
Use 4 screws on top frame and 2 on bottom frame for each arm.
4 screws on top will hold the arm in place and 2 avoid vibrations.
2 screws on bottom will hold the body well.
You can use multiple pieces (body_taller.stl) to make it taller.
But maybe you need adjust the feet.