I’ve put together a model of a sort of generic sauropod using my usual 3d cut and stick sketching technique. Often models like this come out messier because of re-cuts and re-positioning but this one wasn’t too bad.

Rather than just having a static model I’ve decided to make the head and neck poseable with a joint at the top and at the bottom like in the sketch below. So, next step, Make a body/tail using the existing model for sizing , design the cross piece with sloping ends to fit into the body, make the neck/head.