The mod will work better if it doesn't rely on third party websites. An option to use them may still be kept in-game, however the default should be the official mojang api.

Here's a rundown of the requirements:

• Create module to covert a username to UUID e0a0daf
• Write hooker for Mojang api e0a0daf
• Write loader for skins from the api 861c85b
• Test across versions / test api.

Has been implemented for a while. Went under the radar