Well, that's all for now : thanks to Skwasjer's S3D 0.9 I did in three hours what before would have taken days... I guess that's what SDK is...
Just the bridge view doesn't work



if I move the node the whole tower goes up !
Version 1.3 available in a few for download at :
http://files.filefront.com/IJN+Type+.../fileinfo.html