Mimicing Unity's Transformation System at Runtime

[alpine girder]

Hello y'all. In my game I have a level decoration editor that I'm trying to get up and running.

call it inception, if you will.

Of course, I can always use the Inspector to change individual elements, but I want a quicker workflow, therefore I created a seperate scene to try and get some general Transformation working

But, this proves to be a pain. I can indeed move, but I have no idea how to actually do the other important things, like scale, and rotation

I don't know if i'm just taking on a super complex task in the wrong way, but this is essentially my script so far (enjoy my shitty comments):

https://pastebin.com/bgaHafnr

I have more sprites, I guess. Rotation

and scale