Raualduke, I'm not an expert on WW I tanks, but I had a go with Emhar's MK V Hermaphrodite, built as a Male:
http://www.ipmshawaii.0catch.com/Newsletters/Nov-08-%20Newsletter.pdf
The file for Part I is appraently damaged, but Part II covers the most important upgrade, the tracks. The rest of the kit is more or less useable, althoguh the cannon barrels are very out of round. A puch set is useful to replace any rivets lost to sanding. The kit looks like a POS in the box, but new tracks and a coat of paint do wonders to make up for it.
If any armor kit manufacturers are reading this, WW I tanks are wide open for the taking! Personally, I'd like a St Chamond.