I have just finished with a project, and do not have any more in the pipeline at the moment. If I am hired for this project, I will be able to give it my full attention and will deliver on time. From the time that I have started working in a freelance capacity, I have nailed all projects assigned to me. Additionally, I am well-versed in working on your project, as I have worked on a similar one before.
Apart from this, I possess all the skills that you have outlined, and can effectively work towards tight deadlines.