Ooh! Boarding pass invitations are so nice! I think as long as your website is updated to have the latest and greatest info, you should be set. A lot of people I've seen do a pretty standard invitation but keep all the destination/hotel details on the website. Plus, more people will refer to your website for details than the actual hardcopy invitation. You can post up suggested packing lists, schedule of events, reception meal options (in case some people have dietary restrictions), dress code, FAQs, registry and other details on the website and it's a one-stop-shop for your guests. Congrats on having most of your guests confirmed with their deposits!