Have not done it but I would suggest a little heavier leather. Probably 6oz if you can, this will be stronger and will keep some of the weight down. You could probably use the one you allready have for the overall design. Throw ina bunch of your own designs and such and a little bling like some conchos or some lace or something. Sounds like a really cool idea. You sure he wont mind all the extra attention he'll be getting at the shows.
Ooops 2-3mm, I wanst reading corrrectly lol.