Blender Acoustic Tile by over2sd

This is an acoustic ceiling tile for Blender for all your office buildings.
The tile is grouped with its T-rails for easy placement. The numbers are the seamless offset values.
I have included an ungrouped copy of each piece for easy edge-of-space filling, since my experience was that any edits to single members of a group linked in to the same scene as a group would modify all the group members. As always, I want to improve these models, so criticism on how I can improve them is always welcome.

Problem with the file? Could this have been better? Tell me how.

Scale is 1BU = 1m. I got tired of doing calculations on the imperial measurements.
Blender version 2.63

This model is Public Domain (or CC-0, if there's no PD in your location, or CC-by, if all else fails), so do what you want with it. You don't even need to give me attribution. Just don't claim you made it yourself. If anyone asks, or if you wish to attribute the model, "some guy on dA" will be sufficient.
Although nothing is required to use my models, I would appreciate a comment if you do use it, so I can see how much my models are being used. And please don't charge for this model.