As a former proposal writer in the tech industry, I'll try to answer
your question and provide some resources. Getting started on a
proposal is tough!
What you are calling "modules," I would normally call "sections." The
list of modules you presented would be an "outline" of the proposal.
I would be careful about using one set of modules or one particular
outline for each of the four proposals. You will probably want to
develop customized sections and a customized outline for each
proposal, depending on how you develop your answer.
If you have a Request for Information (RFI) or a Request for Proposal
(RFP) document from your prospective customers, that is the best place
to start. Use your prospective customer's own outline from the RFI or
RFP to develop your own "modules" and outline. What I am saying is
that you should use your prospective customer to guide the structure
of the proposal. Read the directions (if any) they give you, and
follow them closely!
Here is an example of an RFP:
It is important to include these items though: 1) table of contents,
2) executive summary, 3) costs or budget, and 4) appendices and
bibliographies (if needed).
I also found some resources that may help you.
A step-by-step approach to constructing a proposal:
A short article on "how to handle a request for proposal:
A decent list of proposal writing resources, geared somewhat toward
grant proposals (but still relevant):
A business-oriented article on proposal writing:
Some general writers' links:
Once you have an outline, you may want to consider enlisting some
help. Pick topics from the outline, and if you have someone who can
help you with a particular topic, ask him or her to help. Establish
clear guidelines for your helper, especially in terms of content and
DEADLINES -- since it is you who will be ultimately responsible for
completing the proposal.
Also -- using the keywords below on Google, you will find some
professionals who advertise proposal writing services, like some who
you can find on Elance ( www.elance.com ).
I'm sorry that I am not more specific in evaluating the specific
modules you suggested, but it's nearly impossible for me to comment
without actually having an RFI or RFP, or some other detailed
description from your prospective clients.
Personal knowledge, plus keywords on Google: proposal writing
And again, Google keywords: proposal writing guidelines -grant
One more set of Google keywords: business proposal writing guidelines