Cover Sheets in Proposals: let me insert my portfolio, team, etc and send w/ my proposal

Handoff’s proposal is too limiting. I want to introduct my project team, our custom portfolio, show some full 8.5×11 custom sheets that our marketing team prepared. I like sending the proposal from Handoff, but it’s just too plain. Help me win jobs by building my full professional proposal. Otherwise I’ll keep sending the proposal from a different tool.