Answer by Suminda Sirinath S. Dharmasena for What is it like to perceive without 5 Skandas?

If body is not needed, then is Nibbana attained only at death?

According to the Pali text references are made to Nibbana as sopadisesa and anupadisesa. These, in fact, are not two kinds of Nibbana, but the one single Nibbana, receiving its name according to the way it is experienced before and after death. - Buddhism in a Nutshell - Nibbana

What is it like to be without skandas?

You cannot exist without skandas. Nibana is like the flame blowout.

I could not perceive the state as we are constantly bombarded with internal and external stimulations which makes me assume that this state can never be achieved and only an incremental change towards nibbana can happen.

Yes. It is a gradual process where you pass multiple stages before the glimpse of Nirvana and also after until final Arahatship.

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