What is the best size for homemade slingshot bow door

The best size of homemade slingshot bow door is 35-45mm. the specifics are as follows:

1, wooden bow general bow door do not big, most of the common wooden bows are flat leather special, bow door size can refer to the size of the bow door of the traditional bow, that is, about 35-45mm (inner bow door).

2, the standard width of the bedroom solid wood door: 0.8-0.9m. Kitchen door 0.8m or so, bathroom door 0.7-0.8m.