The aim of the workshop is to address the machine architecture and its cryogenic and vacuum systems and compare options in view of defining a baseline solution. The workshop will last one and a half days with oral contributions and ample discussion periods. Sharing the expertise from other labs is essential. Experience from similar existing or planned machines is expected to be presented, as well as the possible options for the SPL. The workshop will be held in TE auditorium (30-7-018) on Monday 9 November, and in room 112-R-028 on Tuesday 10 November.