Hi there Lennart,
Here is what I can add regarding your questions:
W.Nr. 14743, 14801 and 14830 are all Bf 109 G-2's.
Bf 109 G-6:
W.Nr. 161713 "NP+XV", 13. JaSta:
http://www.flickr.com/photos/2809206...57625360814585
http://www.flickr.com/photos/2809206...57625360814585
W.Nr. 161717 "NP+XZ" "Biala 6", 13. JaSta:
http://www.flickr.com/photos/2809206...57625360814585
http://www.flickr.com/photos/2809206...57625360814585
W.Nr. 161718: certainly a Mtt-Regensburg built Bf 109 G-6, no other informations known.
W.Nr. 161720 "NQ+BC" "Biala 3", 13. JaSta, no known picture.
W.Nr. 161722 "Biala 1", JaSta 13.
http://www.flickr.com/photos/2809206...57625360814585
W.Nr. 161728 "Biala 2", 13. JaSta.
http://www.flickr.com/photos/2809206...57625360814585
http://www.flickr.com/photos/2809206...57625360814585
Cheers
Marc