Steve, looking at the pics of the bottom, I'm wondering if it would have been possible to create a couple lower suspension arm parts that would just glue to the existing chassis plate? I think that's all it would need to look great under there. , , , *PIC*
Wouldn't need to be complicated. Just a couple, or even just the one part representing the lower suspension arms, sway bar and maybe the steering arms.
It could easily be made to just glue on top [bottom?] of the K-member to make the chassis look complete.