Just a followup to let you know how we solved the problem....
View the floor plan in ADT, then copy and paste into Corel Draw (perhaps you can use a different program) then have Corel Draw rescale it to the required 700 pixels, save to a two tone bmp file.
Take a peek at http://www.robinsonplans.com and the I series plans. I think they turned out rather well.
Thank you all for your input, it helped us to get on the right track.
John