Dear Sir,
I've seen your project description and I'm ready to start right now!
I can offer you a nice smooth design also the implementation of it in open cart, but a budget of 30$ is way to low for something truly beautiful for the design point of view!
I mean, with all the respect two starbucks coffees in an airport ... do you want your design to be "two coffees "? :)
With consideration,
Florian