Build an ERP software for contruction

The software is to manage clients, suppliers and labor e to integrate a small part of the managing process. Sellers should be able to create construction quotations estimates and share it with the client or export it to PDF (It should have exactly the same functionalities of Sigma Estimates) Once it is shared to the client, he/she should be able to report any errors on the quotation After the contract is signed, the project goes to the planning phase, where the software generate the quotation resources, including the labor that should be done. The list goes through a revision and the alterations are used to update the composition library. After the planning phase, the project goes to execution, where the client sees the engineer diary and the user sees all the invoices, including an image, its price and the money to completion of project.