Hi there
I have gone through your basic detail specification, As you mention you need to build a WebsiteBuilderscript similar to HTML5.
We have 4+ years of experience in Wordpress, Woocommerce, wp-plugin development, HTML to wp-theme, and 5+ years of experience of web development in PHP, Magento, Joomla HTML5, CSS3, JS, Jquery, Android, iPhone.
Our each developer having 3 to 8 years of experience in each technologies.
My team is very Expertise in HTML5, We are ready to give Dedicated Service and Long time Maintenance service after work complete.
can you please share me more detail specification in personal chat..
Thank you
mage