H.K. Porter makes a flush cut (flat blade) bolt cutter that I have used for similar jobs. The Amazon price is about $27.
http://www.armstrongtools.com/h-k-p...sh-cut-blades-and-plastic-dipped-handles.html
I'd use my 4.5 inch grinder with a cut off wheel on the nail heads.
Here to tell you huys that old time nail puller i posted does a surprisingly good job.I was about to suggest a grinder. It seems a grinder would be tedious to keep from cutting into the metal. Looks like he has lead head nails so some breathing protection might be needed?
Here to tell you huys that old time nail puller i posted does a surprisingly good job.
Put a board under the part of the tool against the siding and you will have very little damage. The one timed i used one years ago i was amazed.I'm sure it did. Those are good at pulling nails.
If you were pulling the nails did you get any damage to the siding?
You need this. View attachment 525278