Open Cart EXPERT

Hello, I am developing a site for a client, they would like the same functionality as the site below. The end result would be a sticker that would then be sent to the customer by my client. The process we need is as follows:

Select a font from a selection of 2, type in a word, you then see that word in the font you have selected, you can choose the size, you then pay per letter. The end result is that the customer will get a wall sticker witch the client will print based on the order the customer has placed.

Example Site: http://www.veer.com/products/fonts/finder/

Our site does not have to scroll down or react in the same way as the example, it just needs to have the same end result.

Have not got the URL for the clients site but it is being developed in OpenCart and I believe the example site is windows otherwise we would have just used this as a guide.

I have OpenCart developers but they can not work out how to do it so I need a real wizard.

Any questions please let me know.

Thanks.