exporting/importing Problems

[bumbibanane]

soo, i'm pretty new to modelling for tf2 and i have some problems that i can't solve:
http://s1.directupload.net/images/140907/g8kt8ii4.png

1. as you can see the hat is completly at a wrong position and in blender everything seems right ( http://s7.directupload.net/images/140907/3borbe46.png )

2. as you can see there is no texture / it's invisible if you look from below and in blender everything seems to be right

3. when i just take this buggy import and verify it and try showing it in the model viewer, it says error, couldn't load model although it kinda works in sfm (it shows up, for some reason there is more than a bip_head: a few more bips. i checked that the hat is only assigned to bip_head in blender and it is). This might in order of the other 2 problems but i'm not sure

i'm pretty desperate, though i hope for help here :)