I didn't see that yesterday but ventral tank's rack must be slightly located on the left. The rearward nick of the rack must be on centerline of the fuselage.
>> Modellius : Will be this Bf 108 B civil or military plane ? If it's a civil a/c, seats are OK. On military planes seats were made of fabrics. Another detail : don't forget to make curtains under the transparent roof of the canopy.