Hi There,
I am an Australian designer who would love to work on your tumblr theme. I have worked on many tumblr themes before either from scratch or editing others from base so I am used to all the framework needed. I work with you every step of the way and offer unlimited changes and revisions to make sure you will leave the project with 100% satisfaction.
As themes differ so much, so does the price. Without seeing the sketches or having an idea of what you are looking for I really can't give you an accurate quote on price or time. When you have a few minutes spare please contact me and we can discuss and you can show me the sketches/ideas and I will be able to give you a better idea of price and I can show you samples or create a quick base of how it will look.
Hope to hear from you soon,
Holly