Servant's Bell:
Overall height of servant's bell 250 mm (10 inches).
Overall width (scroll) 150mm (6 inches).

75mm (3 inches) across bell mouth

Shaker Box:
38mm x 75mm x 80mm (1.5 inches x 3 inches x 3.25 inches)

Overall setup:
Minimum overall width 275mm (11 inches), height 250mm (10 inches). (When setup with 50mm (2 inch) gap between shaker and bell)
Allow extra 75mm (3 inches) to width for swing of bell