Gurluas, your skin file needs editing.
Soldan told me (thanks again ) to change all TexUnit flags whcih differ form 0 or 16 to 16. If you have to change it you also have to change d4 to 1. And change all orderids which look extraordinarily big (e.g. 16000) to 1.
That should hopefully fix your model.
If everything fails:
Here's a working deathwing dragonform as comparision.
http://depositfiles.com/files/imfaqjz86

That's odd. And you tried deleting the cache? :/
Because the last time I had that issue (on the offical server that is), I fixed it by deleting the cache folder.

Do you mean, if you play for example a taunka you can not see armor on yourself (and all other taunka) or on all other players as a whole?
Because if you can not see armor on taunka that is probably because they (the models) have no support for armor textures. I think that is model related. I'm not sure how to add something like that, but I think I read about that somewhere here... But there are quite some modelers here taht should be able to help you better.

For you frist problem. I think the m2 is not allowed to intersect with the wmo. I'm not sure though as I never tried. I just think I read it somewhere before, so no guarantee.

And your second problem. You can try to open the adt in a program that can manipulate adts. I know Taliis is able, but Taliis also tends to destroy adts. :3 You can delete models by model path with it. Make a backup of you adt first as always. :>

Spells require combo points in the AttributesEx column.
ee the Wiki for this.
In my mangos core (which is quite old...) the flags for combopoints are:
SPELL_ATTR_EX_REQ_TARGET_COMBO_POINTS = 0x00100000
and
SPELL_ATTR_EX_REQ_COMBO_POINTS = 0x00400000
You have to set them for your Spell.

In a comment in the server source it's indicated that warriors use combopoints, while not shown ingame, to indicate whether or not to be able to cast overpower. I'm not sure if that is a hackish piece of code (but since mangos doesn't usually use hackish code I doubt it) or not.

So I think you can add the combopoint flags to a mana spell and then may need some server side modifications and it should work. For client side display of the points I think you'll have to make some ui changes.

I have the same error and for me it helps to import them. As soon as I copy a wmo either the source wmo, the copied one or both are gone after loading the adt again. But when I import it from mv they mostly save... It's rather annoying for keep walls where you would usually copy wallpieces all the time. :/ Maybe that helps you a little.

On blizz maps I fly with the camera to the water surface, look at z-axis and use that value. If it's slightly off I fix it by trial and error. I think it goes in 0.25 steps but it has been ages that I needed it, I might remember it wrong.

You try to concatenate a string with a nil (not set) variable. Look in your lua at the given position. Concatenation is done by: .. (double dots) E.g. "Bla"..VariableName.."blubb"You now have to find out which variable is causing your problem and then initialize it correctly.