Hey there @BStoneArch! If you want to use a spline mesh, all you have to do is move the spline endpoint to expand it. However, depending on how much control you want over everything you may need to use splines and handle the meshing based on those points.
Here’s some resources:
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I’ve got a couple resources that could help with that!
Basics of spline manipulation in BP:
Longform training on splines and spline mesh:
