I have a 1972 Service Manual which has all the Floorplans in it. I don´t know how much the floorplans have changed, but it is a great help with our 1971. If you want a copy just let me know, I think the copying costs about 15,- Euro or little less.
PM me your email address, then I can send you at least the two pages showing the 25 foot Floorplans!!
PS: What a great feeling, that more and more Airstreamers pop-up overhere in Europe!! Let´s see how long it takes until we have our own WBCII Unit Europe???!!!