I was wondering if somehow exist ( now that we have pets that battle) a table able to create , modify and robots that would be used as pet 's or followers . Or that create a mecha that could be edited , so that instead of buying a new mecha I have to buy / create better pieces.
This sounds like a great idea, there are similar concepts like this out there, the first to come to mind are Gardenbots and Frackin Universe, but nothing as complex as you are talking about.
Like a grid on which you put items to determine the stats, abilities and appearance of your mech? I don't think it exists, although I would like to see whether such a thing would be possible.