well, when you use that ink-print decal, try to clearcoat it after printing, however i would recommend clearcoating it even before printig, only for sure
and the seatbelts:
http://www.carandclassic.co.uk/uploads/new/150736.jpg
seat belt is divided into 2 halfs, lower half is just passed throught harness (it means that you can easily pull the belt to adjust it for your body), upper belt is passed too, but its stitched on wrong side
hope you undrestand me, because my english is poor