I was originally going to throw a thread up documenting Happy Home Designer's hash regions - but I figured why not just make a tool for it instead? One thing led to another, so here's ACRehash. This tool is capable of fixing checksums on Animal Crossing 3DS saves, allowing for offline editing of exported save games without any browser/RAM hacks.
Nintendo Animal Crossing Happy Home Designer Amiibo Card Katie 107/200 USA Version. by Nintendo. 5.0 out of 5 stars 1. $7.95 $ 7. 95. $3.99 shipping. Only 2 left in stock - order soon. Colton - Nintendo Animal Crossing Happy Home Designer Amiibo Card - 233.
English Happy Home Designer logo. Australian Happy Home Designer white New Nintendo 3DS bundle
― Happy Home Catalog, Happy Home Designer Adds the Window, Curtain, and Door tabs to the player's catalog, along with a number of new decor items. A player can remove (and then replace) existing windows, but cannot change the number of windows; doors can only be modified in multi-room projects.
What to Do: After you've set up your town in the game, press the A Button on the title screen, then select "Link HHD data.". When asked if you have a copy of Animal Crossing: Happy Home Designer, select "I do!". Select either "Retail version" or "Downloadable version" (depending on which version of Happy Home Designer you have).
I just stumbled upon the abuse you got over the flags and I feel your pain. It doesn't seem the matter which of the "big four" you don't present asap with fanfares without someone being after your blood regardless of your own id.