Map your post type and category archives to a page, and also map your 404 template to a page as well. Three helper blocks allow you to display a post grid, a term (category) grid, and posts by category.
Redirect 404 error page to homepage or any other page, with logs. Supports permanent (301), temporary (302) redirects & not found (404). Super easy to set up & use.
With this simple plugin you can assign custom pages (with custom content etc.) as error pages. This works for 404 (page not found) and 403 (forbidden/permission denied).