Upfront framework expansion by outside devs

I am exploring the possibility of replacing Page Builder with Upfront for my departments intranet. I developed a number of expansions for Page Builder (specialized elements for menus, multisite content, third party application integration, ect. Specific to my internal user base.) and would need to rebuild these to work with Upfronts framework. Are there any resources for developers such as myself? Just looking for some shortcuts to figuring it out and to see if it's a viable path. Thanks