Mike, I never use groups either. Only components. That being said, I do understand your question. That's a poorly executed model. All the faces are inside out, the materials are applied incorrectly... It could be that the author never used groups or components or perhaps they did but exploded them all before uploading the model to the warehouse.
As for the text, it's 3D text but it wasn't extruded so it's really only 2D text. Either way, it is created with the 3D Text tool. I used that tool to put the numbers on the tiles for this Shut The box game.
And for a Christmas card I made a couple of years ago.
Part of the problem with the dimensions is that the author use an architectural template with precision set to 1/16 in. I can cut closer with a chainsaw! Just kidding but if you're drawing woodworking type projects and working in fractional units you should work with precision set to 1/64" and also turn off Length Snapping.
It would be fairly simple to redraw that model correctly so that it could be used as a plan.