Build me an APP for our company.

We run a kitchen company, where we sell luxury kitchens in Spain.

I would like to create an APP for our clients to have full transparency on the process once the contract has been signed:
- Upload files; contract, plans, elevations, fact sheets, designs, etc.
- Order of the kitchen status; ordered, in production, delivered, installed.
- Add a calendar
- Contact details: Sales person, Technical service, etc.
- Other components.

Please give an estimate price for the entire project. and also per hour cost.

Thank you,