MacRorie has just updated the ordering checklist for the Atari 1088 XEL motherboard sale: http://atariage.com/forums/topic/271135-1088xel-atari-itx-motherboard-pre-order-interest-thread/page-1
The 1088 XEL is a complete ground up redesign of the Atari 8-Bit Computer Motherboard. It still uses the standard Atari VLSI chips, but is in a Mini-ITX Form Factor. Completed motherboard can be ordered via the above forum link and more project information is available here: https://ataribits.weebly.com/1088xel.html