Hi, I'd like to do it.
Please see my portfolio for a few samples of my work, I'm confident you'll see I can provide the quality you need. However, I must mention that I can't do voice-over, and I won't do a mockup without being awarded the project, a lot of people ask for that, but many freelancers such as myself don't have the time and luxury to create mockups for free, without any guarantee. Thanks.