You can access more info on the Si on Honda's page and build one now.
http://automobiles.honda.com/civic-si-coupe
http://automobiles.honda.com/civic-si-sedan
Hondapro Jason mentioned this in his Hondata video from Youtube. He said dealers could install this. Some may agree to doing this and others may not. It's up to them. I would do it, but that price for a sport hatch is redonkulous. I wouldn't pay over 21-22k.
I have an interest in the hatch due to carrying volume and hatch opening size. Have ran into issues with fitting things into my sedan. Rear door openings aren't that large to fit taller items in either. That is the biggest factor for me at least.
You can save some money buying the sedan too as...