Aaah.It's all a bit tongue-in-cheek. I was actually thinking more along the lines of BMOW's Classic implementation project, which is still kinda silly to tackle on the level of a PowerBook Screen Hack. [)] ]'>...
Well, that's different. Assuming you've implemented, say, a Mac Plus in an FPGA it wouldn't be a huge stretch to redesign the video section to output to an LCD rather than a VGA port. You'd just need the data sheet for the LCD.
(I do know from reading datasheets that some old pre-LVDS panels require some very non-CRT-ish refresh techniques. For instance, I remember in particular the data sheet from a given 640x480 monochrome panel describing how the top and bottom halves of the LCD were separate fields that were refreshed simultaneously, IE, during the same clock pulse you needed to send the pixel data for dots on both line 1 and line 241. If you wanted to use something like that you'd have to change the memory/framebuffer scanning pattern appropriately and it's possible that might introduce a low-level timing incompatibility with some piece of software that, for instance, tries to exactly time a page flip or other mode change based on the position of the CRT raster. But software like that is I'm sure vanishingly rare in the Mac world.)