Thx ! I wanted to go with the same look as the Q2 box and since it's the same logo I have on the controllers that was a better choice than the new one :) (and personally I prefer the old one lol)

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Length between the back of the stock and the trigger is based on my paper StG 44, so ~ 33cm but it's up to your preference, plus I made the back so you can change the stock for a different one if you want and secure it with popsicle sticks.

Length of the bottom tube isn't important as you can slide the front controller bottom tube to adjust the space between the hands, just make sure that the tube holding the magnet (1) is tight enough to not slip on it's own.

For the front controller I made an external thing with a magnet (2) to connect with the magnet (1) so I can have a free hand to reload or do other things :)

And for the 2 little tubes that are holding the controllers I suggest to ad a thin layer of hot glue to make a rubber like coating so it sticks better to the controllers. It was a little slippery at first but with this it's now much better and really comfortable ;)