Here are pictures of what we have so far. The machine is a wee bit too high (about 1/8") over the desk top after adding the Janome mat but I'm okay with that.
[ATTACH=CONFIG]429858[/ATTACH][ATTACH=CONFIG]429859[/ATTACH]
We still need to cut and add the plexiglass to the left of the machine. I think this will work. I might look for a floor mat that is a little lower than the Janome mat so that the machine would be completely flush with the desk top but for now I'm just happy that it isn't making me dizzy from the bouncing when running the machine.