Developing personal drawing with help of grabcad models allowed?

Hello,

I am making a part of my own, with the help of some parts i found here. I made an assembly with the found parts and have been drawing my own parts around them.
First of all, is this allowed? I am not making any money out of it, just using it for my own reference.
But i would like to share my build on Thingiverse (allso for free), i just didn't do this before.
What i don't want, is to affend some kind of rules regarding copyright or something, so maybe someone can send me in the right direction?

I have no problem sharing my models here, but i am a absolute beginner, so a little embarrassed to post .....
Attached file is the assembly of found models, including my own design. I think you can see which ones are mine!

Thanks in advance.
Fred.