Here is a website I came across that had some ideas regarding water tanks, extra stowage, safety additions, etc. Thought you guys might enjoy taking a look and maybe help with the ideas in the making and adapting process.
Picts are included on the site.
http://www.atomvoyages.com/atom/aboutatom.htm
Ah yes- James B has done some great things with Atom. He's been round the world in her at least once, perhaps twice now.
EXCELLENT site.