What you’re talking about takes more than just a 5 minute conversation with your boss. You need to do the research of the competitors websites. Show the standards in today’s development and why certain implementations won’t work. At the end you could throw in a few good examples of designs that match the client’s area. To conclude, you should add that you’re worried that this might not work and would reflect poorly on the company you work for.
I would print all that information and create a small packet for you to hand to your boss.