"Rustyironworks" --
I bought the Unicatch "USC7 1/16" It's a 22 gauge "Fine Wire Stapler". $60
http://www.fasteningdepot.com/cgi-bin/front/item.cgi?pid=7&cid=2&ctl=n1QINcLgoVsIt goes down to 5/32" (had to go to a speciality roofing store to get those; home cheapo never have heard of this gun). It's too much of a speciality and non-home remodeling.
A cheap version might work (depth & gauge are correct; 1/4 and 22ga) - it's used. Only goes does to 1/4" -- might go further with a different brand of staples in that gun. My opinion - 1/4"s will give you a tear through in some areas.
http://cgi.ebay.com/BeA-tools-3-8-AIR-UPHOLSTERY-STAPLE-GUN-STAPLER-401_W0QQitemZ120414213475QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item1c093f1563&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50
or ebay bid # 120414213475
I'd buy the new. It's what I used and it was absolutly incredible. When you get stuck - email me at gzeck2 at yahoo dot com.
Do the int panels first; then the side trim; working your skil up to the one piece cockpit surround in the back. I also used it for the seat bottoms (larger staples).
The best part about doing interior's this way -- you can remove the staples when you don't like the looks of somethign and re-do.
GO SLOW. It'l look great.
George