staging (n.) Look up staging at Dictionary.com
"temporary structure or support," early 14c., verbal noun from stage (v.). As an adjective to designate "stopping place or assembly point," 1945.
stage (v.) Look up stage at Dictionary.com
early 14c., "to erect, construct," from stage (n.). The meaning "put into a play" is from c. 1600; that of "put (a play) on the stage" first recorded 1879; general sense of "to mount" (a comeback, etc.) is attested from 1924. Related: Staged; staging.
doolally (adj.) Look up doolally at Dictionary.com
"insane, eccentric," British slang, by 1917 in the armed services and in full doolally tap (with Urdu word for "fever"), from Deolali, near Bombay, India, which was a military camp (established 1861) with a large barracks and a chief staging point for British troops on their way to or from India; the reference is to men whose enlistments had expired who waited there impatiently for transport home.