Stripping down the blog

Hello.

I am a first-time user of WP, and it seems to me that this is the Blog to use!
I am making a homepage for an upcoming, danish singer/songwrite who wan’t to have a blog on her site.
I wan’t it to be a very small blog, able to run in a 545px width iFrame (vert. scroll-able). I imagine a blog-front with simple lines of topics and date of posts – and nothing else! Each topic should be opened as a simple text-site as well (with the possibility of the user to attach pictures to her posts).
I don’t want any “log-in” on the public site or any other links on the posts other than perhaps “previous” and “next” links.
And also, there should only be the one person able to write to it.
I imagine her loggin in from an non-linked site – hidden from the publik site.
It is important that I can use a jpg background image in fixed possition.

Take a look at https://www.annikaaakjaer.com to see what I meen. You’ll easily spot the righthand-side iFrame i want to use for this.

Now, is it possible to strip down WP to do this job?
Or even better: Does anyone have a theme/setup for this I can use?

Regards

Jacob