Where can I find this? Or something like it: http://mysims3blog.blogspot.com/201...nd-dresser.html The door, most importantly

Thank you! <3 :D

You might also be interested in this DIY Buy set by Armiel, you can arrange the pieces in so many different ways!

http://modthesims.info/download.php?t=468320

Those look awesome! Some of those will work pretty well as utility room doors. You know, the little doors that open into ac's and whatnot? If anybody has made any of those things that would be great too.

You mean air conditioning units? There are a few floating around, though I haven't tried them with the DIY buy set (great idea!):

Air conditioners and water heater by sweetmint: previews and download link (scroll down to "sweetmint")
Custom search on TSR: https://www.thesimsresource.com/dow...%20conditioner/

And I know you didn't ask about this (here I go again... ), but I also like these radiators and heaters by cyclonesue: https://www.thesimsresource.com/dow...ms3/id/1059233/
I've started including them in every home I build

Here are two closets (Sims4 to Sims3 conversions).