UPGRADE LIST
Compiled a list of upgrades, the items they can be installed on, the upgrade parts required to install, etc.
A few things about the list I've made:
-Many items are listed more than once. "Self-Cleaning", for instance. The reason for this is, most of the objects that can have Self-Cleaning (etc) require different amounts of upgrade parts to install.
-There are some upgrades for the Backyard Observatory and Life Under A Microscope items that I cannot figure out what they actually
do.
-> I also do not know whether upgrades on those two objects count as Electronic upgrades or not. I suspect they do.
-I did not separate the upgrades by Basic and Advanced, as that would have required grinding another Sim in handiness and checking each of these objects several times along the way, and I did not feel like doing that.
-I did not look for possible upgrades on career-unlock objects, as this test Sim has not unlocked any of them.
-Upgrades on the Steampunk Flyamajig appear to be linked to the Rocket Science skill and not the Handiness skill, so I did not include them.
-This should not be considered a definitive list; I did not check every single item in the Buy Catalog, only the objects in the Plumbing, Appliances, Electronics, and Skills & Activities tabs, plus Fireplaces. There are probably upgrade-able objects I missed.
Anyway, I cannot figure out an easy-to-read way to list all the relevant information here on the forum, so I put up my notes in spreadsheet form on Google Docs, found here:
https://docs.google.com/spreadsheets/d/12pxlhGwI87c4lppsRwcBUfbYxNsvHcnQE4OXaIotgWE/edit?usp=sharingMOAR TESTING - UPDATE
-I've done two more new Sims, quickly cheated some Aspiration points onto them, and compared their sales prices of Knife Blocks to before and after giving them the Marketable trait. Either my game itself is bugged, or Marketable does not influence the selling price of workbench items.
-Have not discovered any new workbench projects from Flirty, Confident, or Playful moods. Do not expect to find new projects from Tense, Uncomfortable, Embarrassed, Angry, or Sad moods and don't plan on testing them. I could be wrong, but I'll save my poor Sim the trouble of being abused like that.
-It appears that any object upgrades unlocked by the Handiness skill can be installed by Sims regardless of their other skills (i.e., computer upgrades can be installed w/o having any Programming skill). The exception is the Steampunk Flyamajig, which is upgraded with Rocket Science skill instead.
And, with that, I've done about as much research as I am wont to do for this skill. I hope I've been of help, and happy Simming!