Thanks for the feedback! I'll try to hit everyone's comments so far...

mikew99 and FlyerChrisK both pointed out that you don't know which version you're on when you search on seatX. This was my first inspiration for building something; I find it very frustrating when I'm booking on a DL 752, for example -- I think there are 10 different versions of that aircraft circulating. I have access to APIs that I can cross reference to determine which version you're on if you search by flight # and date (or city pair and date). So problem solved there. I wonder if it would be possible to get the tail numbers so that different versions of a hard product could be flagged.

mikew99 brings up another key feature I would add: tagging seats with both structured and unstructured user-supplied data and updates. The structured data points seem pretty obvious to me, and if I miss anything someone can point it out when using the beta version (hadn't actually thought about the gaspers, that's a good one!).

As for plane-specific threads on FT, I also use these, and I think I have a way to let people share this info per the above. If people use the site and post similar comments/info, then we won't have to dig through FT to read about individual seats.

FlyerChrisK: by accuracy I mean placement and sizing of seat and cabin elements. Getting to 100% would be difficult, but passing experienced human eyes over a map would go a long way. Take the seatguru DL 764 map - it's missing a galley and two closets at the front of the J cabin, and it misses the staggered nature of these seats on the right side (the odd rows are next to the windows, not the evens).

llcooljayce: the above should explain a few ways that this site would be different from seatX. another key differentiator would be that the maps would all be up to date, and since this has become a weird obsessive hobby of mine (as is flying the latest hard products on various airlines), I would happily keep this updated.