It's Max Biagi's Yamaha 500... The one that ehhrrr... had the tendancy to loose the front-end whilst under pressure from a yellow Nastr Azzuro Honda #46, if I recall correctly.
No Marlboro decals, but it can be obtained from a variety of shops and a variety of manufacturers - try Studio 27 to start off with. Without it, the bike does tend to look a bit bare!
You can see a pic of the finished model on Tamiya's site, if memory serves me right. Also try hlj.com - they have good references at times. They'll also sell the "missing" tobacco sponsorship. Otherwise, how is the box-art?
But if there is a real prob, tell us which decals are included and somebody will try to help. I have not done the bike myself, but we'll be able to sort it out, don't worry...