Create a document cover using style class

Question

I'm wanting to create a latex class called projeto.cls that should create this report cover image below, which has the following headers and footer for all reports generated. The fields defined entrie tags should be variable (define) \title {}, \subtitle{}, \description{},\revision{} (xx), \date{}, \description2{}, \author{} produced by the file .tex. The table appears only on 1st page.

I already have the following source code: .cls and .tex

File: projeto.cls

%File: Projeto.cls
\ProvidesClass{proposta_projeto}[2014/06/03 v0.1 Proposta de Projeto class]

\LoadClass[11pt,a4paper]{article} % Font size and paper type

%\usepackage[left=0.75in,top=0.6in,right=0.75in,bottom=0.6in]{geometry} % Document margins
\usepackage[margin=2cm,headheight=5\baselineskip,headsep=1\baselineskip,includehead]{geometry}

\usepackage[brazilian]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}


\usepackage{tabularx}
\usepackage{graphicx}
\usepackage{multirow}
\usepackage{lastpage}
\usepackage[iso, english]{isodate}




%----------------------------------------------------------------------------------------
%   HEADINGS COMMANDS: Commands for printing name and address
%----------------------------------------------------------------------------------------

\def\projeto#1{\def\@projeto{#1}} % Defines the \projeto command to set name
%\def\@projeto {} % Sets \@projeto to empty by default

\newcommand{\printprojeto}{\@projeto}

%----------------------------------------------------------------------------------------
%   PRINT THE HEADING LINES
%----------------------------------------------------------------------------------------



%% set up and width for the tabularx environment to expand and fit to.
\newlength{\headerwidth}
\setlength{\headerwidth}{\textwidth}
\newsavebox{\myheader}
\begin{lrbox}{\myheader}%
    \begin{minipage}[b]{\headerwidth}
    \renewcommand{\arraystretch}{1.29}%
    \begin{tabularx}{\headerwidth}{|@{}c@{}|X|c|c|}\hline
        \multirow{2}{*}{\includegraphics[scale=0.75]{image1.png}} & \centering\normalsize{Método de Instrução} & \small{DOC Nº} & \small{MI.02} \\ \cline{2-4}
& \centering\large{PROPOSTA DE PROJETO} & \small{Versão:} & \small{06} \\ \hline

\multirow{2}{*}{\includegraphics[scale=0.75]{image2.png}} & \multicolumn{1}{c|}{\multirow{2}{*}{\textbf{\LARGE{ >  }}}} & \multicolumn{2}{c|}{\small{Data: 08/10/13}} \\ \cline{3-4}
& & \multicolumn{2}{c|}{\small{Página: \thepage\ de \pageref{LastPage} }} \\ \hline
    \end{tabularx}

    \end{minipage}
\end{lrbox}
%% Setting up the header
\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
\lhead{}
\chead{\usebox{\myheader}}
\rhead{}
\lfoot{\small{RG-481}}
\cfoot{\small{Revisão: 01}}
\rfoot{\small{Data: \shortromandate\today}}

And the file 'projeto.tex'

\documentclass{projeto} % Use the custom projeto.cls style
\title{>}
\subtitle{>}
\description{>}
\revision{>}
\description2{>}
\date{>}
\author{>}
\begin{document}
\section{Section 1}
\section{Section 2}
\end{document}

How could I create this document?