Here's the initial test-fit on passenger floor pan. I still have a fair share of cutting/grinding on the residual edges of the old floor pan, but that's the easy stuff (just time-consuming). Once the final fit is complete, I'll drill a number of small (3/16"-ish) holes to plug weld to the existing floor, unibody frame rail, and inner door sill.
I'm pretty impressed with the fit of the replacement floor pan from Sherman Auto Parts
(again, a Michigan-based company