Dear Sandip, a certified standing order is a property of the company. That is not supposed to be shared by publishing in the internet. The model standing order as it is can be adopted or you can make your own changes in it. However, one thing that you have to ensure is that there is no clause in the standing orders which is against any statutory rule. For example, you can not incorporate a clause that " salary will be disbursed on 15th of every month" or "salary will be given in the form of wheat or rice" or " no employee can claim gratuity" or " bonus will not be applicable", since these are against the prevailing law and even if you add these clauses with the concurrence of the employees and their union(s),the standing orders will not be certified.
Regarding state amendments, you have to check it by referring the Gujarat State Rules itself.
Regards,
Madhu.T.K