I have the Venture Trunk on my 98 Royal Star Tour Classic II. It was a direct bolt on and looks awsome painted to match the bike. Just to ease your concerns on costs I paid $500 for the complete setup wich included the trunk mount, trunk, speaker pods, backrest pad, upper rack and the grab bars. The only think I had to provide was some extra bolts. I found my setup on one of the star boards on Delphi Forums.
Here are some pictures just before painting it, I have not taken any since it was painted. I am hoping to add some to the album this week.
http://s249.photobucket.com/albums/gg238/dcgtls/1998%20Yamaha%20Royal%20Star/