; FIXME: Figure out what keeps us from deleting RAM:ENV
You cannot delete it, because it is in use. You assigned ENV: to it. Remove the ENV: assign before the delete command, then it will delete without error.
; FIXME: Mount needs ENV:, but this will cause a message
; to popup later from the normal startup-sequence.
Startup-Sequence issues a message because it wants to create ram:env directory but it already exists. Either delete ram:env before you run startup-sequence or assign env: to somewhere else.
Assign env: ram: will do the trick and also saves one line from your script.