Shawbury is certainly worth a visit on the Assault Glider Trust Open Days .... they had one last week (combined with Armed Forces Day) so I guess there won't be one for a while.
I've also seen a video (can't exactly remember the title as I'm not where the vid is at the moment - something like Silently to War) which includes the larger Hamilcar - carrying a Sherman tank! Also in the video were snatch take-offs in the Waco, you just sat there while the passing Dak hooked you up ...... obviously didn't have whiplash injury compensation in those days!