Big Train James
Western Thunderer
Atlas sd35 trucks would be more appropriate. I believe there is a change in appearance after the 35 series.
Not sure how adaptable a gp9 frame would be. There's quite a bit of difference between the gp9 frame and the sd9 frame. Notably the louvered doors along the full length of the SD9. I think these might be battery box covers. At any rate, the gp9 has quite a bit of different detailing. It might work, or might be enough work that starting from scratch might be preferable. Might be useful for the pilots though.
Not sure how adaptable a gp9 frame would be. There's quite a bit of difference between the gp9 frame and the sd9 frame. Notably the louvered doors along the full length of the SD9. I think these might be battery box covers. At any rate, the gp9 has quite a bit of different detailing. It might work, or might be enough work that starting from scratch might be preferable. Might be useful for the pilots though.