A solid effort. It's nice to get a sense of what a kit/blank combination might look like, but with the caveat that the emphasis is on "might".
It would be nice if your flash image allowed two separate controls. The first one would allow you to rotate the blank to your preferred position on the kit, and the second would rotate the kit and blank together for a more natural look.
What I liked most about the program was just seeing the blank move. It gave me a better idea of what it would look like, and as a result I've spotted a number that I'm going to have to try.
I would like to see an option to just download the blank files and have the ability to play them without the kit. If I have a customer with me, I can probably give him a pen to play with in the finish he wants, and then just play some different blanks for him to consider. Maybe have a subscription service where we could be notified when new blanks were available; a blank of the month club if you will.
Overall, a very intriguing option.