Here are some of the computers in Mark's collection. He is owner of Altairk kit Serial #003.
Heathkit H8 on top and an Altair 8800B on the bottom
Mark's "Mark-8" kit provided by Obtronix (Steve Gabaly) - On the left are two IMSAI 8800s
Inside the Mark-8
Mark's custom riser card and motherboard backplane for the his Mark-8