I wouldn't try to run Tiger on it. Not so much for processor and memory concerns (I have it running on a G3/300 with 128 MB of RAM,) but due to the low screen resolution.
The clamshell models only have an 800x600 screen, which is woefully too little for OS X to run reasonably. (Some programs won't run at all at that resolution, others are just plain hard to use, because they expect 1024x768 at the minimum.)