TechPowerUp checked out the SilverStone RM42-502
A quote from the article:
The SilverStone RM42-502 is a 4U server rack chassis for building a potent dual-socket system for heavy workloads or rendering jobs. As such, it is sturdy as well as functional at its core. Even so, you are able to transform the chassis into a full SSI-EEB and SSI-CEB compatible tower case.SilverStone RM42-502 Review