Pzazz - I think you are 100% correct......... that is a big under taking I too am a garment sewer and I don't know if I would be cumfortable cutting 2 vintage dresses and then finding out it didn't work. What a bout buying a simple wedding dress and using the two vintage dresses to add a train to the all ready made dress.... think that would be more within the relm of things.......... any left over materal from the vintage dresses could be used for other special occasions like baptisms etc.
Well for what ever it's worth that is the way I would go..............
Scrap Quilter.