the pspice model file of CAS480M12HM3

Emma

Hello, now I need a model of -40℃~175℃ for CAS480M12HM3, but the temperature range of pspice model provided on the official website is 25℃~175℃. I plan to build it on the basis of the existing model of pspice, but I have some problems in understanding the existing model:
Is the schottky circuit diagram of mosfet drawn by me according to the existing model correct? If not, where is the error?
1.Do Gds and GRds represent changes caused by changes in threshold voltage and on-resistance respectively in the MOSFET forward circuit diagram? If not, what do those two stand for?
2.What is the role of R1 and Rbypass in the MOSFET forward circuit diagram?
3.Now I want to expand the temperature range to -40℃. What changes do I need to make if I want to modify the existing model?

Looking forward to your reply