Here is the said spreadsheet : Heeeeere
As it is a huge database, it wouldn't be reasonable to just let everyone run free in it. So for now it's visible only, and if you have models to add, just comment them down below, and shoot me a pm with your email address and I'll add you in the sheet.
How to document your keyboard :
1) take a picture of the front
2) take a picture of the label on the back or of the label inside of the keyboard
3) take other pictures you might find necessary
4) upload them onto either a forum, or an image hosting site, imgur preferably
OR RESPOND TO THIS FORM (but I don't check the responses often, it's better to reply here or pm me

I have to shout out the members that helped so far because god damn we've put out a lot of work

ENORMOUS thanks to : ball00n, DJSwayde, Drclick, hansichen, Lbibass, mike52787, mindgame, Noobmaen, subcat for their patience and their work.