jbeaming help

This is what happens when you randomly connect beams to random nodes like you did here without knowing what you are doing at all... It can't work. You should learn where to put beams properly. From my experience, for individual body parts it's the best if you follow wht's done in the vanilla vehicles, with various beams with different values serving for different purposes. So you have some beams for the main shape, some surficial crossing ones that are easier to deform, rigid beams that are less stiff, etc. You might also want to set up some rigidifier nodes, it can be too soft without them. When connecting parts together, it's the best from my experience to attach each node from one part to 2 or 3 nodes from the other part that are close to it (but not too close, closer to like 5cm than like 1cm) and each one is in a different direction relative to that node, for example one is above, one on the left, and one in front of it. Then it comes to finetuning which can also take many hours and often you will have no idea what is wrong but it can turn out it was a simple thing you can fix in 2 seconds. I hope I have helped.