I understand Supreme court in its recent judgement held that registration if Will is not not necessary. It also says that no need of any witness and if the Will is written on plain paper, that will also be Valid.
According to the Section: 18 of the ‘Registration Act, 1908’ the registration of a Will is not compulsory.
The testator must sign the will in presence of at least two independent witnesses, who have to sign after his signature, certifying that the testator has signed the Will in their presence. It can be written even on a white paper.
i can let you know more if you send me the copy of Supreme Court judgement referred by you.