Hi!
I’m learning Javascript and threejs. The best way to learn is to do something by youself. That’s why I decided to create my own 3d editor. I created a blog and I’m posting there all my steps of creating. You are welcome to follow this blog, maybe somebodody give me a good advice or critics 
My blog is here https://dragon3dgraff.ru/
Sourse code github
Hey! Are you planning on maybe writing in english? You seem more than capable 
. It’s hard to follow the blog or give advice if I don’t understand a word 
You could also check out official Three.js Discord. We have a Russian channel so you might find some additional audience
Oh, this is first very good advice 
Really, I have to translate it to English 
I’ll do it very soon!
Done! I translated. Now my blog is bilingual 
I implemented save/load functions, export GLtf, manipulating object (Move, Rotate, Scale, Drag) and cloning it, merging scenes
https://dragon3dgraff.ru/2020/04/26/saving-loading-and-manipulating-2/