A Simple Form Class (Gathering Environment Contents)

First the code for the class file sample-form.cls:

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{sample-form}[2014/11/03]

\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}

\ProcessOptions

\LoadClass[a4paper,12pt]{article}

\RequirePackage{environ}

\newcommand*{\form@fillin}[2]{%
  \makebox[#1][l]{\rlap{#2}\hrulefill}%
}

\newcommand*{\form@layout@fillin}[3]{#3: \form@fillin{#1}{#2}}

\newcommand*\@name{}
\newcommand*{\name}[1]{%
  \renewcommand*{\@name}{#1}%
}

\newcommand*\@projectdescription{}
\newcommand{\projectdescription}[1]{%
  \long\gdef\@projectdescription{#1}%
}

\newenvironment{ProjectDescription}{\Collect@Body\projectdescription}{}

\newcommand{\makeform}{%
  \section{Applicant Details}
  \form@layout@fillin{8em}{\@name}{Name}
  \section{Project Description}
  \@projectdescription
}

\endinput

Now the sample document:

\documentclass{sample-form}

\name{Mabel Canary}

\begin{ProjectDescription}
This project will be very interesting.

This is another paragraph.
\end{ProjectDescription}

\begin{document}
\makeform
\end{document}

Download sample-form.cls and sample-project-form.tex or sample-project-form.pdf.