Hi

The mamselle 52 looks a nice plane and certainly a suitable plane to start with, Just build it as it is. to scale it up to double its size is not just a case of building it bigger, you need to have a reasonable idea of how strong the airfarme will need
to be to cope with the flying stresses and bigger engine.

also a double size one will get expensive. a big engine prob at least a .90 ,many rolls of covering and a couple of trees worth of balsa.

If you really want a large vintage type plane go for one of these kits

http://www.benbucklevintage.com/shop...ndex&cPath=1_5


Simon