Yeah I understand some of them will be difficult, especially the games with plastic pieces. But some good pictures for those would be better than nothing I guess. But to play the games that require extra plastic pieces or boards best way would also be to actually own the physical pieces or boards. Can't really see other way of playing them.
I mostly meant scans for the overlays or game cards or high resolution pictures of the actual handhelds like Merlin or Split Second for instance since those games could definitely use an overlay.
I wouldn't be too much worried if they aren't in the best shape, a bit of photoshop work can do wonders.