I started fitting the snorkel this morning, Pretty straightforward, but before I got trim crazy I wanted to make sure it didn't hit the cowling anywhere, so I pinned it in place and tried to fit up the lower cowl. Had some running with the aft edge of the cowl openings and the fwd lip of the baffle ramps on both sides, so there were several iterations of cowl on/off and trimming to get about 1/4" clearance up there with the cowl installed. I have no idea if 1/4" is enough. The RV7 instructions are really sketchy about this. It's on my list to research, but for now, I've confirmed that the cowl and snorkel are going to play nice with each other. Once that was done, I went about fitting the snorkel per the RV14 instructions. They have you attach the air filter frame with snorkel inserted into it, then clamp the lower flange to the fuel metering unit. Then instructions have you draw a circle 1" larger than the hole on the aft face of the snorkel flange, then center it on the fuel controller. I accomplishes this by measuring 1" out from the edge of the hole in multiple places and just connecting the dots. I was goin crazy trying to get this thing centered using this reference lines and just could not make it work out of the longest time. Finally, I discovered that the hole in the snorkel wasn't round. It's got a slight oval shape of 2 7/16" in one direction and 2 1/2" in the other. Therefore, my reference circle was oval as well and this is what was throwing me off. I pondered this for a while and decided that Vans elaborate measurement system was maybe a bit overly complicated for my needs. The throat of the Avstar fuel controller is only 2 13/32". So if it's perfectly centered, the hole in the snorkel is 1/32" to 3/32" bigger than the hole in the controller depending on where you measure it. i.e. I've got a little room to fudge it if need be without closing anything off. With this in mind, I focused on just shifting things so that the flange on the snorkel was flush with the avatar unit and it wasn't rubbing on the starter or oil return line for cylinder 2. Once I got it sitting pretty, I dusted off my amazon special endoscope, which refused to link with my phone...shoot, no what? I discovered that when I removed my iPhone SE from it's protective case, it was small enough to fit all the way into the snorkel, so after a few attempts I was able to get a movie of me slithering it down into the snorkel and having a look-see in person. I made several adjustments, with a new phone session each time. Eventually, I got everything within my parameters. Once I was happy with the fit, I traced the outline of the fuel controller flange on the aft side of the snorkel flange & drilled then clecoed the snorkel to the air filter flange, which fixed the relative fitment of everything. After all that, it was pretty simple to lay out the hole pattern and trim the snorkel flange to size using Van's supplied template. The fiberglass it quite thick on that flange, so I cut it with the same cutoff wheel I used for the canopy in my dremmel saw-max. I Installed everything again just to make sure, then glued the snorkel and filter flange together with a epoxy/flox mixture per van's instructions. Nothing more to do with the snorkel until the epoxy dries, so I spent the rest of the day sealing up all the nooks and crannies on the aft baffles with RTV.