Help me fix some problems in my model please.

This model was built by my firend with Maya, but it has some errors after importing to MED.
From the engine preview:

1. The alpha channel seems does not work with his hair, I use 32 bit-tga,here is the link for tga:
Download: http://www.mygame4.us/mayavideo/Item.tga
2. Look at the back of his shield, double face texture doesn't work. Do I need a shader or I can fix it in MED?

Forget the wrong normal map with his right leg, I know how to fix it, but please help me fix problem 1 & 2. Thanks.

Download: http://www.mygame4.us/mayavideo/man.zip

1.)i have no idea.
2.)you can fix it in MED. Just select shiled, copy&paste it, and use "flip normals" button.

1. Its the issue of alpha sorting.
Means, everything might be alright with your hair, although you can't see it.
To show the hair within the engine you need to give the model a certain material to skip the sorting.
Or, save the hair and the other part as two different models, where only the texture of the hair gets an alpha channel.

Thanks. It is a way to solve it as you said, but it will increase the number of faces, and we can make it with Maya. I think there was a way to show double faces in the engine, but I cannot find it.

You can use a shader to show both sides of a face:

technique t0
{
pass p0
{
CullMode = None;
}
}

Could you tell me how to fix it, I still can not handle it.
I found a shader like this:
http://www.opserver.de/wiki/index.php/ImprovedOverlay
but can I just deal it with MED?

Thank you, it seems that I can only deal it with shader. I will try it.