I'm a freelance UI designer. Together with a developer buddy, we're putting together a website proposal for an industrial machinery manufacturer, which includes a custom catalog and an ordering module. We estimated a total budget of 130.000 TL and an 8-week delivery timeline. Both of us have our own sole proprietorships.
The client expects a single corporate proposal document and a single point of contact throughout the project. But we're stuck writing the proposal. I'm handling the UI, wireframes, and approval workflows; he's writing up the database, server architecture, and admin panel. How should we blend these scopes in the final document presented to the client? Should we quote one lump sum or price it module by module? And most importantly, how do we protect ourselves internally and handle delay liability in the proposal without making it look like a risk to the client?