Ok some parts and blanks etc are on order, I'll be able to verify fitment without forking out on an expensive part that may not fit right off.
I also figured out a really nifty way of mating the top of the part with the tank edge where the bear claw runs and incorporating that into the drawing of the top cover, it's very labor intense, so might not get to this for awhile, but certainly not until I get the backplate in and test fit.
In the name of expense, I think I'm going with to go with a production back plate from ReVerie as well as their ITG filter. The plumbing will be 3d printed, allowing for nice tapered perfect curves on the runners, this will get you to a mountable large face intake filter, similar to Warp 9.9s setup. From there, Ill be finishing the cover, which is roughed out already, and joining it with the contour along the bottom of the tank, edged with a fine rubber cover so nothing touches directly, but its not critical to be air tight there.
So this project is on hold, at least for the moment until parts arrive.
ON THE OTHER HAND:
I have been thinking a lot about the stock setup and runner lengths etc, and, it would seem they had a good idea spoiled by a few things, in particular: Where to put the filter, noise, plenum volume limited by location, emissions, and targeting the very very bottom of the RPM scale with it. I have idea for secondary concept inspired by the stock intake, guided by the Rotrex pressurized intake, with a little spin on proper runner length to get 2nd, 3rd, and 4th harmonic at usable RPMs on a mostly stock R3. Clearly this wont be super simple, its going to look like an octopus, and its going to be a nightmare to install/remove, however, in my head I can see it fitting under the stock Bear Claw and providing nothing but gains in horsepower.