I managed to make the surface look like what it looks like.
Part link: surface2solid.SLDPRT - Google Drive (34MB size so that's why the Drive link).
I'm trying to turn this surface model into a solid part but I fail every time. There is 1 or 2 plane that needs trimming but I can't since it's knitted, not even with a new planar surface. See surfaces on attached image. Anyway, could someone help with this? I really need this turned into a solid