How can train scencformer with 3D-FRONT

Hello,  Because of unavailability of SUNCG, I'm thinking of using 3D-FRONT to train sceneformer. And I have the following questions:

What need to be modified in codes?
What is the data structure under suncg_data?
If you have any code to make 3D-FRONT compatible with SUNCG, I would be most grateful.

Thank you very much for your help in advance.