Majsteve,
I think the agility of the boat is more important than hull length when it comes to creating something exciting to watch.
Really close tackticle racing on a course that is not too big makes the best viewing.
A 22ft boat with a 12ft beam will tack slower than a shorter boat with an 8ft beam. So I think the wider beam will slow the action down and work against your objective of showcasing the sport.
Close racing is also much more important than who is racing
If you can get something like this off the ground the paticipants will develop a following not because of their past achievements but because of their performance in the series.
Having them racing is unlikely to be a draw card because Mr Joe average doesn't know them yet.
If you need to draw the big names to present a better case to your sponsors I think the way your project is promoted will be the key to drawing in the big names.
If you have people to support your initiative you are over the really big hurdle and I wish you the best of luck.
Regards,
Phill