Yeah I have a ton of extra metal so I could always extend it upwards, but honestly a spacer to compensate for the 1/2 inch tilt is infinitely easier and won't really be much of a sacrifice. Finally starting to weld them on last night felt so good, hopefully it will actually be done by Sunday this time.Yeah, I think I had the luxury of playing with unmodified replacement floor pans for a Bug early on in my Sterling adventures and I do think I remember one border being a little higher and/or the pan was stamped a little deeper towards the outer border.
I never noticed that particular note on those diagrams before. You’re right that that isn’t written very clearly.
I wonder if you could cut or grind the flange off on that side and weld just a flat piece of metal to extend it up the extra bit (and just go without a flange in that area like they seem to suggest in that cryptic diagram.) Or like you said just use as is and make up for it in however you mount the seat. Either way your dropped seats will still be a huge net gain.