After some additional thinking on this, I think my plan will be to bore out the inside of the OEM intake neck enough to have the v-stacks slide/snap in. Then I need to maybe drill in two flat head screws to secure it, or perhaps a thin layer of jbweld to keep it in place.
For the filter's slight relocation, all I should need are two thin strips of metal, similar to battery ties to ensure it doesn't pop out of position. Based on how snugly it fits, it should require much to secure it.
The top can simply be the OEM one, with the "frame" modified or removed so it just covers the opening. I might even simply bolt it to the front section to ensure that the OEM lid clamps will still keep it all together.
Essentially, the rear section would go in separately, then the modified front section plus filter would be locked down and sealed to the rear section. That should actually work, and make changing filters only moderately more challenging that it would have been on a totally OEM airbox.
So... question: What sort of hole saw like tool/accessory do I need to shave the inside of the neck precisely?
Also, is there something I could use that would create a slight tapering as I get to the desired depth to snap in the v-stack, and help ensure a smooth transition from V-stack to OEM intake neck?
Would I be better off taking this to a machine shop or something???
Looks like I need a tapered shell reamer -- something like this
http://canadatool.ca/php/images/stor...rs%20taper.jpg ?
Anybody have any advice/relevant experience on this one?