hummmmm, i'd not heard that one about chopping the front end metalwork before?
i'd got Gary to cut me my original floor pans and i certainly didn't chop any metalwork off the front and mine ended up ok. i admit that it doesn't lip under at the front as it's a bit high due to bulkhead/chassis rail differences (LONG story!), but even if i had the front lower and lipping over, i'm sure i would be fine?
I'll have a look tomorrow and see what the clearances on mine are like as you've got me thinking now!