Nice plane.  She looks sharp.  For that window you might also be able to just use a scrap piece of clear plastic from some packaging.  Testors has a clear window glue that is supposed to be able to create a window like that.  You run a semi heavy bead of glue around the perimiter of the window and then use something like a straight pin to "brush " the glue from one end of the window to the other so it forms a film over the hole.  Think like when you blow bubbles the solution stretches across the hoop you blow through.  I was able to get the glue to form the film but I felt it was kind of yellow looking not clear, and it sagged a little also.  So I either don't have the skills yet or the product doesn't meet my expectations.