Monitor was nothing fancy, think most came with just a standard G07. Yes, the laserdisc player has a standard video out, the game uses a video converter board with the monitor.
Standard 19" TV will do as a replacement - you just bypass the video converter card and plug the LD directly into the TV, that card has nothing to do with gameplay. Just make sure you get one that can be turned on and off at the wall plug, ie it 'remembers' it was turned on when you turn it off at the wall, so you don't have to turn the TV on separately when you power on the game.
Speakers are tricky to find in that size... They're about 20.5cm if I recall.
- J