Customization of OpenSource Android App

Hello, We want to customize an "open-source" Mobile Android App which is used for encrypted communications (text messaging and file sharing). The encrypted messaging options currently are TOR, Google Talk and XMPP. We only want the option "XMPP" available, others should be not available. Thereby, we need the end-to-end encryption should stay on (using OTR via XMPP). Also we want it in our own layout, so the logo has to be changed into our logo. On every location where the demo logo is used. Plus skip all links and referrals to the demo open-source application. We need this over the weekend. If you can do this before end of Sunday, we offer you $250. Plus continues part-time job to improve the open-source application further in our style and higher protection. Hope to hear from you soon.