Reskin of a popular game for Apple IOS

I have the requirement to reskin the popular game Avalanche Mountain for IOS. This includes all new artwork for the game to a theme that I will provide. Artwork for iPhone, iPhone retina, iPad and iPad retina. All images currently in use with the game must be replaced and supplied back to us. In addition, you will need to design and supply an icon for the game (I will give you some general rules about the styling of the icon) and then supply the icon in all formats needed (I will supply you a list of all icons required and their width and height). There is also the need to do some editing of the screenshots of the game. We will provide you with the screenshots of the game, and you will need to edit them and add some text to each image (that we will provide). There will be 5 images that this needs to be done for, and you then have to supply those same 5 images in too other sizes (for a total of 15 screenshots). I will supply you all the standard artwork from the game. You will then need to create a new image in the exact same width and height and supply that to me with the exact same filename, in the exact same folder. And then continue that process for all files in the project. This then allows me to just copy the new images you have created into the project. In the case of title screens, you will need to create them as well but we will supply the game name, and any text that needs to be changed. Basically this is a standard reskinning project. Ideally, you will have worked on Avalanche Mountain before. At the very least you should have completed at least one reskinning project - Please give me some details of what you have worked on before. I am looking for a competitive quotation for this. I will have a lot more reskins so this could be a long term relationship if you can do a good job.