Well, really for my GM. I am planning on making a Makeshift Scrapper Rogue for an upcoming games. If anyone has an charts or other advice for determining the stats of improvised weapons, I would greatly appreciate it.
It's easier than that. If it's the size of a club, use club damage: 1d6 bludgeoning. If it's pointy, same damage but piercing. If it happens to be sharp, same damage but slashing. If it's bigger, go up to a d8 and require two hands. If it's smaller, go down to d4. If it's soft and/or squishy, use non-lethal damage. Done.