Corporate Advisory - Word Document Proposal Template

My company is in need of a professional and contemporary Word Document template for written proposals to clients. Our team is currently using one I put together myself, but doesn't look particularly great. We already have done a lot of brand work, so you will have an amazing brand to work with. I'd like the header and body fonts, etc to be locked, so that its hard to mess up the formatting. If this Project looks good, we might extend the Project to also do a PowerPoint template also.