This one looks quite grim, but still it's worth trying.
You may use R-Studio
to do that. This article gives you an overall concept on how to work with RAIDs in R-Studio: RAID Recovery Presentation
, this is R-Studio's on-line help
, and if the file system of this RAID is NTFS/FAT, this free software will help you in finding RAID parameters ReclaiMe Free RAID Recovery
R-Studio is a pay program but it allows you to estimate whether you can recover your files before buying it.