I've set up the framework as described in https://modthesims.info/showthread.php?t=481967 , unpacked the .sims3pack with Delphy’s pack multi-extractor, and placed the .package in the package file I created in CAW. It doesn't appear to have plugged in properly xP

Was hoping someone might be able to take a quick peek under the hood and tire-kick my files?

Objects need to be flagged for the world editor, there's a great guide on it by Simsample here

Thank you! I've done it!*

*(It's definitely supposed to be that size xD Back to Milkshape I suppose xP )

Although on this topic, is there anyway to tell how large an object will appear in-game when it's open in TSRW?

It would be wonderful if TSRW had an add-on to let us know the size each CC should be in the game... But, unfortunately, in all these years that I've been a creator, I haven't found another method other than exporting the clone of the same category as the object being created, and comparing the size in Milkshape.
I also have a clone of the Sims' body, which appears when you create an outfit for example, and I usually use it in Milkshape as a reference for size.