That looks like a really nice 124 / 3012 - I'd just give it a polish, a bit of oil where needed and plonk it in a plinth with something a little more in keeping to the arm like a DL-103 or even better an SPU. I'd not be in any rush to fart about with glass platters etc, Thorens knew what they were doing when they designed the 124, it's a really nice deck as is. The top platter and clutch mechanism is actually a real pleasure to use, especially if you have any 7" or 10" records - it makes getting them off the platter simple.
In fact ergonomically / usage-wise I don't think the 124 has ever been bettered: stoppable top-platter, pop-up dinked 45 adapter, quickly and easily removable arm board (makes swapping arms a 5 minute job), built-in bubble level, levelling thumb-wheels accessible from above etc etc. It's as near perfect a design for a record player as I've ever seen.
Tony.