Hi , Since I am unable to post photos as my server will not allow it , some tec reason beyond me , If you go to Track Link and then Industry you will find details of the B-4 Howitzer tracked . Photos of test build and some new wartime photos . research needed is in M hobby magazine issue 7 -1997 , 4 pages of photos and 4 pages of plans , it is big , 27cm long , 7cm wide and 7cm hieght with track length 9cm and 1.5cm wide . magazine is long out of print but does turn up now and then, cheers ian

Ian, ALL the photos of the test-build have been posted both here and on P.M.M.S..

However, as you say, there's some interesting data within the thread, it can be seen:

http://www.track-link.net/forum/news_industry/14062