Build form using Google App Script (Not Google Forms) sending to google sheets and prepare packing slip

I would like to design a form using Google App Script that sends information to a google sheet and generates a packing slip that gets sent to the user.

I have a sample script and form that can be used as a base to achieve the results but the following are the conditions:

* The script must have validation for example to validate if the contents of a specific cell is a number.

* The form should have an intro to explain the process and a thank you page that summarizes what happens after the use submits the information

* A mock up is provided using Microsoft Excel Forms and VBA. This is for illustration purposes only but will be a great asset in understanding what we want to achieve

* The form can be similteanously used by several users (usually 1-6 at a time)

* Some fields appear or disappear (get disabled or enabled) depending on a choice from a drop down.

* If there is a viable alternative to Google Apps Script/Google Sheet, I am open to suggestions.

* The script should be easy to modify (not encorded) in case I want to rename columns. The beautiy of using Web App Script is the ability to use HTML to control where every thing is placed.

A sample Excel sheet on how I would like this to operate:

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Google App Engine Electronic Forms AJAX Google Sheets jQuery / Prototype

Project ID: #27762795

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