Pylontech stacking frame

I design this stacking frame to be able stack Pylontech US300C LiFePo4 batteries one to each other. I think the original frame is too much money. Hope you'll find this useful.
This frame is compatible with original Pylontech frame, so one can combine both.
There is also the STEP file in the ZIP so you can change the size for the other types of Pylontech batteries easily.