I have both the mantis and cliffy, and I first put the mantis in and it's a beefy thing, I'm sure it works great but like the picture above, I am not sure it would stop that from happening or not since those areas are still exposed. So then I put the cliffy on and it covers the inner walls and the top area but not as beefy on the inside as the mantis obviously. I actually tried to install both at the same time and it barely doesn't work. So I had to choose one. If the mantis was just a hair smaller in the U shape it would have actually worked with the cliffy.

Also installed the Arcade 3.1 and wooaaah this is the best mod I ever seen. The screen is so clear and all the detail is amazing. Everyone that sees it says it's their favorite part of the whole machine.
Love that it still incorporates the flasher inside the machine also.

Also for those asking about the shaker, I think it's great in Tron. Was skeptical at first but it actually goes off a lot during game play at a lot of key times. More than I thought it would.

Just got my black mirrors today to, haven't installed them yet, gotta figure out the left gap, my left ramp rubs the left wall so there is 0 clearance for the mirror, so I'll have to make some adjustments, my black nickel apron should be here soon also.

Cool stuff, ya I was gonna go buy some paper or poster board or something to as I hear they scratch easy. Your cab looks real good and now I'm super hyped to get mine on there. I also opted for black mirror flippers with blue rubbers, I haven't put those on yet either but I think the overall look is going to be great.