[Checkout] Anyone done a CheckoutPrint plugin?

I'm new to this forum, so my apologies if I'm posting this in the wrong place.

I'm part of a martial arts school and I'm one of the photographers for gradings and other activities. We use grading photos as a revenue stream for the school. Currently we take a ton of photos, print off A3 contact pages and stick them on the wall, students select the ones they want, fill out a photocopied form, hand it in and pay the money, then wait for the photos to be printed off.

I'm trying to improve this process by putting the photos online (http://davidedwardsphotos.com/bushidokan) into Gallery. We don't have the backend processes to support paypal or email ordering yet, so I want to be able to use the checkout module to produce a printable order form that users can printoff and hand in at the club. The Step2 of the Checkout process is a starting point, but I'd like to make it more like the proforma we use. Has anyone developed a plugin to do a printable order form?

Failing that, I'll have a look at putting one together. I've coded in many languages, but not PHP. Can anyone recommend a good starting point for the php syntax used in Gallery (I'm struggling with things like the '=&')?

From what I've seen so far with the base Checkout module and the CheckoutEmail module, they're both great pieces of work. One suggestion for future features; a "bulk discount" feature (if user selects >X items they get a Y% discount on the total).