Hi!

I have a ´17 Scorpa SC 300 factory. Recently, a rattling sound appeared while stationary, and it goes away once I release the clutch enough that the real wheel starts to pull. It's definitely coming from the clutch/tranny area, any ideas? Is the basket worn out so the plates rattle just a bit and create that noise?

Could be that you just need to refresh the oil, make sure it has the correct type too! Clutches will produce noise especially if the engine idle speed is too slow, causes the clutch to shake and rattle. Worn plates, that is the tags on the plates  will invariably create noise and could affect operation. This could also be the gearbox rattling again if the idle is too slow. 

some rattle is just normal with no load on things

2017 model, new generation clutch, perfectly normal... Some a bit more rattly than others...