I hate to tell you - Ulf, but this is my first electric too, other than a Zagi & a Combat Wing (which are totally different animals). I located the batt. according to the instructions, except that I increased the length of the velcro some so that I could shift the batt. and the rudder servo was mounted with servo tape only. I cut a slot in the side of the fuse for servo arm clearance to go thru and stuck it with servo tape. I'd post pictures, but I can't right now. I went to install the new Norton 2003 utilities the other night, and it has screwed up both of my computers at home. I've been going back and forth with Norton trying to fix it.
Good Luck!
Kevin