Well, if you're savy with photoshop,I could send you a few A3 scans that you could stitch together. Heard from a friend that they do graphics like that. Not sure how accurately it would work with a plane, but you're welcome to try!

I've been hunting around locally for a store to print my plans, but I can't seem to find one! They must exist, since we have plenty of architects etc, but it seems a DXF print to A0 or A1 is just asking too much....