SoundQubed box design help?

[Spek]

Hey so I have 2 12in SoundQubed hds3’s and I’m trying to find a box design that will work with my trunk size but can’t seem to find any. 
The max width would be 29in and the max height as 14.5in with the depth being a bit flexible with 24in and below. 
From what I’ve read 4 cubes combined and 35hz is good. 
I can’t design boxes for the life of me but I can build them given designs. 
If someone could point me in the right direction or help me design them that would be a huge help. 
Thank you!!