Sure, you can buy the Strato Pi board, Mini, Base or UPS version and use your own Raspberry Pi Model B version 2 or 3 or even the Raspberry Pi 1 Model B+. Older versions of Raspberry Pi can’t be used with Strato Pi. Because the Strato Pi board sits on top of the Raspberry Pi and is a bit smaller, you should find several third-party cases designed for Raspberry Pi where Strato Pi could fit as well, like the ModMyPi Modular RPi 2 Case. Just remember that our hardware warranty only covers our products as shipped, without modifications. Also take into account that, using Strato Pi and your own Raspberry Pi board and case, the CE compliance we certify on Strato Pi will not automatically apply to your assembled product.