Could be a great project ~ Vintage Mac Powerbook 520 works great connected to an external monitor - built in greyscale screen had dark plastic coating and it has been mostly removed. The glue remmenents underneath mar the screen but it is NOT cracked. screen is intermittent - brightness and contrast sometimes function and a cursor appears but rarely. Viewed on an external monitor screen - everything looks good.
The GOOD - it boots reliable with the included power supply and displays well on an external monitor - includes a video adaptor or display output. Floppy drive unit is installed. NO batteries. Trackpad is good.
The BAD - screen not readable mostly, might be repairable. Hinges function but there is some binding so must open carefully. There is tape across the lower screen seam to help hold together - see photos.