So an update on the skid plate situation. I got a call from Josh at RCI regarding my email and we talked some. Apparently all I was missing in terms of hardware was just 2 bolts and the installation instructions. For anyone interested RCI does make a modified Transfercase Crossmember that is special order (they reduce the width of the crossmember brackets) to accommodate most bolt-on sliders, unfortunately in my case the CBI's were just 100% in the way and some mild trimming wouldn't help much. So after talking with Josh we pretty much agreed that the best bet was to modify the CBI brackets to install the Transfercase Crossmember (on a side note, the reason the foam sheet was installed between the plate and crossmember was to protect them, apparently you're still expected to take the two apart for installation.
So I snuck the 4Runner in at the end of work today and borrowed my co-worker's cut-off wheel and went to town on the CBI slider bracket, I cut it just to the end of the frame rail because I wanted to secure it back to the frame later. I then mocked up the crossmember onto the vehicle and snugged it in place, unfortunately I didn't have as much real estate as I thought I was going to have so I only had room for one hole through the bottom of the plates. I then spent the next few minutes drilling a 17/32" hole through about a 1/2" of combined steel, which is not as fun as it sounds; I HIGHLY recommend you wear long sleeves and a turtle neck if you're doing this, I have small burns from where hot chips flew around (I was just too tired and tried to wrap a fender cover around me like a shawl... didn't work as well as I had hoped.) After drilling the holes in the frame I removed the sliders to install the RivNut Insert into the frame and bolted everything back together. My only real regret is that I can't reach the top of CBI bracket to drill new holes and install a bolt through the frame to make it a bit more secure, but there's enough bracket left and its secured pretty well that it shouldn't matter. I will more than likely address this nagging concern when I do the body lift later down the line since it should give me enough access to the frame rail.
Here's the bracket after I cut it off and drilled it out for the RivNut insert (the insert is actually already installed in this picture, you can barely see it)
This is a close up of the bolted crossmember over the CBI slider pinching it to the frame, the upper portion is not secured to the frame, I'm hoping the fact its still a L-shaped bracket and that when the vehicle is resting on the sliders the other two U-Channel brackets and natural tendency to push against the frame will not affect structural integrity of the sliders)
Finally a shot from the side of all the plates installed and ready to beat some rocks up! Also, no you're eyes are not playing tricks on you, the transfercase skid plate actually is angled a little like a ramp because of the way the crossmember is installed, so it doesn't sit as flat as the other plates do; honestly I kind of like it like that as it will help shift the obstacle onto the gas tank skid plate hopefully a little smoother.
Post Note-
I'm a little bummed the RCI Skid Plates don't protect the LCA's like the factory plates try to do, but I guess that's why they make LCA skids! I'm thinking those may be the next mod and/or a body lift; not entirely sure at this point.