What should I look into if I want to build a form that searches through custom post types, i.e. a completely rebuilt form? Creating the actual form and it's elements is no problem but the next steps brings up a lot of tricky questions such as 1. How can I pass $_GET data to another file maintaining WP's permalinks intact? and 2. How can I process the posts without having to create a pyramid of if statements and rather use WP's own core functionalities? Searched for hours for a guideline.