Ok got some question here that I just can't seem to find answers to:

Forum avatar - I have set an image of the correct type and size but I keep getting a bunch of error scripts when I try to upload, what's the issue?

In game weapon modification - I was interested in changing the look of my characters weapons using craft but I don't see the option, if I can do it how do I go about it?

Dumb questions I know but hopefully someone smarter out there will know the answer :)

You can use the anvil (crafting) icon off of the radial menu in game to bring up the option to use the craft weapon skill to alter the appearance of your weapons. Note that a failed skill check will use the amount of gold labeled same as a successfull skill check.

With the forum avatar I can't help you other than giving the suggestion to make sure your picture is cropped and saved at the correct pixel height/width.

The uploading of avatars is currently bugged - If you didn't have one before the forum "move", you currently can't get one, unfortunately.

I also recall Arkov saying that armor modification had been removed, and won't be back until the custom crafting system is implemented (no ETA on that yet). I assume it's the same with weapons, if what Beggar said won't work.