I have attempted to convert an STL into CAD by redrawing all the surfaces for this part. However, when I am trying to use the knit command, the 'create solid body' option is greyed out. Additionally, I am recieving the "the piece cannot be joined into manifold bodies because more than two sheet bodies cannot be joined together at a single edge junction" message. I believe this is because the part has internal holes possibly which it is struggling with. Here is my part for reference:

Please let me know if there is a way to turn this into a solid,