Right , tbh I think you would join emulation software more so what i'd reccomend is downloading "Mango" emu it's very clean and neat and easy to read , set up a localhost retro and edit the source test inputs outputs see how the structures and classes works and if you're still interested look...
Are you sure the page id's are right? Did you do ;update_catalogue , and update_items? Did you add them in to the correct folders? From a quick glance the sqls look right however seems as if you just edited the devil statue you should really create them from scratch. Try re-doing the sqls look...
Lack of advertisement has caused it to fall down hill , back in 2013 it was advertised over Google alot which attracted alot of attention.
Right now I don't see Habbo reaching to it's full potential