A tablet driver question

[Steven Hunt]

Hello list,

I bought myself a super-cheap USB drawing tablet, and (shocker)
there's no linux driver that supports it.

Using SnoopyPro, I was able to reverse-engineer the messages that get
passed back and forth to the device, so I'm pretty sure I know exactly
how the thing works.  Given that information, how hard would it be to
make a driver for it, or extend an existing one?

Steve