Hi rtell, it's good to set up a shortcut key to highlight "naked edges" which are edges that only belong to one face instead of being joined between 2 faces.

Those are the spots that need to be filled in to make a solid.

Check out here for how to set up the shortcut key:
http://moi3d.com/forum/index.php?webtag=MOI&msg=6051.2

- Michael

Seems you have some big and little holes in your model to fill for make a solid! ;)

So in your case here it's the bottom area and 2 other places:



The bottom isn't quite all on one plane, it would probably be good to cut off a small amount with a line to get the end all on one plane.

- Michael

Here is the front part made into a solid now.

For the back part the naked edges are very short so it's more difficult to get at them.

- Michael

Here's the other piece as a solid now too.

- Michael

Michael
Thanks! getting that shortcut key set up right now. Only been using MOI for 15 yrs. guess there's more to be learned....
Bob