Dear Sir,
I am an native german speaker, 27 years old and fluent in the english language.
I've did various jobs in the past, which also includes telephone support in english for a big dealer on ebay.
I have an degree in car mechanics and a university entrance qualification.
I guess it will take about 50-60 hours to translate the content, so you are looking for a hourly rate of under $5 based on a fixed priced of $250.
If you are unsure about my qualifications I ask you to send me the login name so I can translate a bit of your content, which you then can proofread.
I'm very pleased to hear from you.
Kind Regards,
Michael