I am interested in playing a customer.
Easiest way is to use the one-timer character sheet provided at the top of the thread and post you customer into the OOC thread. If a girl character wants to play with you, you are good to go. One-timers don't need to be very thoroughly fleshed out, so they are great for a quick entry and for trying out concepts. If you feel you like the customer a lot, feel free to submit him as a recurring one.
Naturally, if you want, you can fly your character idea by me in PM and get my 2 cents.