HTML5 and CSS3 are powerful and can generate documents similar to Adobe Photoshop. I decided to publish a basic proof of concept and get feedback. Feedback has been good so far so the other aspects for a multi-user site have been built.
The site runs on a fast web server with a 75/75 megabit connection.
The server also runs: 3dpartprice.com and jbcse.com
The program wkhtmltopdf is used to make the PDFs from HTML files.
PDF.js is used to display the PDF files.
The template came from Stack Exchange user Jay.