Dear Employer,
I have just seen your proposal and I am keen to write it. I am a writer and I have written for blogs and national newspapers, in my name and my pen name. I am also running a Ph.D in the sciences, hence I am able to write highly technical writings.
Research is hence, one of my strong points.
I am currently without any existing process, hence can commence and deliver within your required schedule.
Many thanks.
Okey.