Followed the tutorial pretty well - I decided I liked it to have a bit of a wibble near the bottom.
The bottom itself after usage was made clear I did a couple of extra things. I selected a few verts and set them all to zero after translating the pin to just above the grid.
The I merged all the verts at zero to go to the centre. This reduced the verts to 794 and made a larger flat surface.
You’ve got me thinking a bit about auto-import in Unreal - I know that has be a recent 4.x feature that still has a few kinks in - but I do believe I’m going to have to at the very least export things to a particular location.