Minimalist engine bay

What's the best way to minimise what's in the bay? And what bits do I need etc? Ie!top fill rad from a ? Relocate battery? Any ideas guys?

Battery to boot, washer bottle run from back. Top fill rad from 1.5 I believe or an old 3 series BMW works I also believe.

Have a look at my build thread mate (in my sig) I've kept the bay as empty as I could. As above battery in boot, washer bottle from the rear of the car, top fill rad etc.