> Could you maybe implement the ability to edit your town's villagers in a way that so you could choose which animals you want in your town?
Please see "NPC_Tool"
http://game-hackers.com/forum/showthread.php?t=1129
re: Nook upgrades
I recommend making Royal Crowns and selling them to Nook (300K Bells each). And with a little time travelling it will upgrade with little effort. Donate the extra bells to work towards the bridge and fountain/windmill. Remember to save that town and use it for future customization.