Patio door frame - anyone painted one?

[seasidechina2013]

Hi all
still obsessed with sorting the conservatory out. The kitchen leads to the conservatory through the original brown patio doors. Was thinking of having these doors removed & opening out then having conservatory replaced with extension. However, garage break Friday in has put me off removing as these doors do give extra security. So, wondering how painting the brown metal white might turn out.
Has anyone tried this please?
still need to sort the roof out though.....