i combined all the posts i could find and further info on the net and made up this measurement schematic. I hope it will be useful to someone in the future. if anyone who has an SD50 can contribute it be nice to upgrade it.
Dark Green overall and Red Oxide striped on the tail
overall : 1100 mm
Body lenght : 590 mm
Body diameter : 200 mm
tail lenght : 620 mm
tail cone lenght: 410 mm
tail cone cup: 210 mm
tail width : 280 mm
numbers of tail screws: 8pcs