Thank you Stephen, I have closed both the fuselages, I am working now on the lower wings of the Blue Max.
This is the lower left wing as found in the box

A detail oft the surface:

Here is the lower right wing as I started smoothing it:

Here is the lower surfaces of both the lower wings:

Moreover, here they are compared with the Pfalz D IIIa at war vol.1 schemas (I hope I am not infringing any copyright)

The wings ave a wrong profile at their tips and I am shaping it better, but they also appear to be larger but I won't dare filing that excess...
Thanks for watching.
Antonio