The botten are a race of constructs I've had kicking around in my head for many years. They mainly inhabit the coldest region of my campaign world Gnarl, though I have yet to bring them into the actual game.
The inspiration for creating this class was simply to mess around with making a "simple" race-class. I was actually staring at the halfling's XP table from the B/X Expert book when I jotted down some notes and that is probably why the Botten class has a level limit of 8. If you don't like level limits, I suggest simply requiring 120,000 XP per level beyond 8 and giving them +2 hit points with each additional level.
Here's the PDF of the class for you pleasure and entertainment.