Do you think it is possible to change your mod for skins in 64x128 (symmetric) or 128x128 (asymmetric)?
Thank you !

Vald

Yes, it is possible.

But since this mod will only be available for 1.7.10 and mojang does not support high res skins on their server, you need to do the modification on your own and setup a skin server for that purpose.

Is it complicated? This requires what level of programming?

Changing some parameters should be enough.

I changed my launcher to use my skin server.
Can you give me directions on what to change in your mod?

If my memory serves me correctly, changing some parameters in these files should get the job done.
/src/main/java/lain/mods/skinport/SkinData.java
/src/main/java/lain/mods/skinport/SkinPortModelPlayer.java
/src/main/java/lain/mods/skinport/compat/SkinPortModelPlayer_RPA.java

Thank you ! I'll see it soon. I might come back for more questions!

Oh, and this one too.
/src/main/java/lain/mods/skinport/LegacyConversion.java

v9a has HD skins support now.