After a while I can finally post some new photos...
First let me say I wasn't quite pleased with the model and especially the fuselage I made. If you look at the first photo in the attachment you can see how the nose of the aircraft should have been (in comparison to the drawing) much more curved than the one I've made. Although main wings looked more or less okay to me, I also wasn't satisfied how cockpit canopy turned out. So, I've solved this problem by making completely new fuselage. Hopefully I've achieved much better look. Now when new fuselage is done, wings attached and putty applied and sanded here are few photos how Bf 110 model looks at this time. After a close inspection I can see a bit of putty and sanding is still needed on one or two places, but the main work on the fuselage and main wings is done. Engines are next...