Update with fitment issues. After messing with the LC plastic for a while I think I have an idea. This is what I've come up with today and subject to change. These are rough pieces and random hardware I had on hand.
The LC plastic is slightly smaller than the Lexus plastics I originally designed around. I grabbed a spindle off the shelf, not modified and went at it. A couple observations, first I'm noticing the frame isn't perfectly flat, there's a bow to it. I think this is normal but it can potentially make other things not align. I think I'm going to write up a procedure to shim for correction. You can see in the picture there's a gap at the top and bottom, I also think the order you assemble things has an affect on how the frame pulls flat too.
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Next, F that steel piece! Remove it! The plastic will bolt to the crossmember and wheel well. This leads me to the next thing. Two birds one stone. A linkage will bolt to the top of the frame mount and will sandwich the plastic down to hold everything in place AND now you have a limit strap. The linkage works similar to the tailgate linkage. The idea is it swings past straight and folds in on itself, there a tab to stop it and locks it in, preventing it from closing. Then to close you just pull on the linkage and it swings shut like normal.
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The plastic fits snugly and could probably use a bit more of a relief but everything goes on and comes off easily.
I'm still experimenting with angles, lengths and things but it's in motion.