Developer to turn interface design into mock up iPad app

Developer needed to create mock up app for client

I need an app developed to present to a client as a demonstration of its function. You will focus on programming the user interface, which has already be designed.

It will be an app for a reinterpretation of Conway's Game of Life. The gaming engine side of programming is being handled by another developer and will be delivered very soon. I require someone to focus on turning my interface designs into a functional app, then connecting the engine to the app when it's completed.

It will only be shown on a single iPad to the client, and will not need to be App Store ready.

Features:
There needs to be a few user customisable features. The user can choose from three background colours, and turn the grid on and off in the game.

There will be a pattern library that will show some of the most popular patterns in the Game of Life. Some will be stills, others will be moving image.

App must be completed by 29th May. Preferable to meet be able to meet in London for discussion and quicker production.