I bought this for DD for Christmas and it is huge as you can see from the picture. I've just found out we're now spending Christmas at my brother's, 200 miles away. I've got a tiny old fiesta. Can I attach it to the roof with straps? My friend attaches a surfboard to his in a similar manner so it seems reasonable... Or are there regulations that I'm unaware of and would be flouting? I really want her to have it on Christmas Day.