Yes, you can add a sheet of glass to virtually any 3D printer.
But, having a heated bed is pretty essential to printing on glass. Although it is possible to use a glass bed on an unheated 3D printer, it isn't recommended to do that as you'll be running into issues with adhesion.
Glass beds work best when you apply heat and an adhesive like glue stick, ...
It would seem that the printer control board doesn't use a CH340 (see bottom of this answer) and therefore this answer should be ignored.
CH340 and OS X incompatibility
The reason your Mac might not see the printers could be down to the USB interface on the printer controller board.
If it is implemented by a CH340 (which is probably is, in order to reduce ...
Exactly what software are you using to slice? From your description, it appears the gcode was successfully generated, but the software choked when trying to draw teh preview image. That could be due to lack of local RAM or problems with memory leaks in the software. This happens when the number of layers and the complexity of the layers gets large.
It took some digging, but I was able to start scripting a wrapper in C# for the RPC commands.
C# Wrapper (MTConnect Implementation)
Unofficial JSON-RPC Reference
I still don't understand what every method does to the machine or necessarily what the results are, so a number of the methods are marked as obsolete until I can test them.
The Mystery of Makerbot-Wiki
According to the Wayback machine, the wiki.makerbot.com went offline on 31st December 2012:
Over the past three amazing years, MakerBot owners and enthusiasts around the world have shared knowledge with us and with each other. As we welcome thousands more MakerBot owners and users into the MakerBot family, we want to make ...
It might be this board, MakerBot 5th Generation motherboard, (original image)
The image was very small, so it is rather blurry, I'm afraid.
I have contacted the suppliers for confirmation, and will update this answer, when/if I get a reply.
However, according to this eBay item, Makerbot Replicator Motherboard Carriage, it could be inferred1 that the same ...