Yeah, Clicks and Clocks has been around for a while...good DIY people. As for why there's almost no DIY for the Intellijel tile format, it's because Intellijel is pretty much the only user of that rail spacing. Everyone else uses the original, which was around for years prior to Intellijel's developments. The rationale, supposedly, is that Intellijel is using a 'true' 1U spacing, whereas the original format is actually derived from the FracRac standard and isn't exactly a 'proper' Rack Unit. Ultimately, I think that's some sort of excuse for something else, but whatever. If you use the C&C 1U endplates, I would suggest getting the 3U ones there as well to make sure your plate thicknesses line up.
And yeah, the mid-point tile row would look awesome at an intermediate angle. In fact, you could do two 1U rows there...and make one Intellijel and one the 'standard' spacing. Tiles are brilliant for sneaking in loads of utility-type functions cheaply.