I can't help you with the front cover, but as far
as the disk drive,
 probably any single-sided, single density 5.25" drive will do, such as a
 Tandon T100 (I hope I got the model right). 
Some Chromemcos were DSDD (such as Tandon TM100-2 (aka PC 360K))
  I have various versions of Cromix on 5.25" and
8" disks, but will have to
 dig these out, and the chances of this happening in the next 2 months is
 close to zero :(  Is that what they used for these systems, or did they
 use CP/M?  In that case, again, I have the OS, but it will take a while to
 dig them out. 
They also used CP/M.
There were a couple of different Cromemco CP/M formats SS, DS, ....
They made some dual processor systems Z80 + 68000, for a LOT more money
than the Radio Shack model 16 (a cheap dual processor)