Looking for Very Small Road Frameset

[penguin]

Hello,
I’m looking for a very small carbon frameset for my son. Does anyone have any recommendations for an xxs or 3xs frameset that has a short seat-tube ideally less than 40cm C-T. Rim or disc brakes is fine.
Thanks
 

[Kitty_BIKE]

Hi friend
 
 We have a XXS-40cm carbon fiber disc brake road bike that meets your requirements, please check the attachments.

[Kitty_BIKE]

Here is a rendering of the completed bike.