Development of a module for Opencart

You must develop a module for Opencart version 1.5.5.1.2 (you can upgrade to a newer version later).
The point is:
There is an online store, works according to the scheme: ordering by the client - order processing by the manager - order editing (adjustment taking into account the availability of goods) - final invoice to the client (taking into account the order adjustment) - invoice payment by the client.
1. You need a module with which you can edit an already placed order in the adminka. There are free and paid modules in which there is such a function, but there you can only delete / add the goods to the order, and you need in addition to the possibility of editing the basic data, the ability to put the status opposite the goods is available / not available, and the goods that are not available, so that the price was 0 rubles, respectively, you need to recalculate the amount of the order taking into account the adjustment, and so that you can automatically send an invoice with the corrected amount to the customer.
2. It is also necessary that all information is reflected in the client’s personal account, that is, after changing the status to the “order processed, waiting for payment”; the client saw what goods are available and which are not, and the final amount of the order.