Recursive cubes 2nd trial

Hello 

This is my second trial to do a customized Koch curve in 3 dimensions.

there are constraints such as the generated boxes should be always at the middle and parametric with the variation of the original box dimensions.

the fractal rule is applied on the edges of the base of the box. First i want to  close the generated curves and extrude each one with a height equals to the square sides a shown in the sketch. I mean the generated boxes should be cubes.

how can i add this command inside python script?????

I hope i explained well.

kindly find attached the gh file and the sketch that explains the idea.

Thank you in advance.