Problems with my model in Unity

I'm not sure I'm going to be able to make a flythrough in unity. I imported my file just fine, however there are some problems with the models panels that make them not appear in unity. I guess there is just not enough information for the program to read I kept getting these problems.

I had a test of what I could do, I tried making a little level made entirely from cubes and this solved the problem, I was able to get the character walking over the level. So even though I don't have time to work on the level to get it into an engine I will be able to next time.

It would have been a nice addition, but I have to focus on what I have!