Sorry to hear about your gash, that sounds painful. Get well soon
That's really cool though that you could even attempt to build a soapbox racer, I wouldn't even know where to begin. Probably just glue some plywood to my car and hope for the best.
Back on to your comment, I think an earlier dinner timer with fastpasses would be adequate. Though, if they can't get them in and have to book them at another character meal, I would at least give them something extra, if I worked at Disney.