Integrating Other Design Enviroment

I'm going to start looking at using the BAG framework with another design environment (ie. not Cadence), probably Xic (https://github.com/wrcad/xictools).

I understand this is likely to be a major undertaking but I was hoping you would be able to provide any tips and pointers before I just start diving into the code base.

Thanks in advance for any help you could provide.