Those pics show a messed up chair IMO. Note the front of the seat cushion is lined up at the front of the seat pan, so if it is the correct cushion correcting the the backrest will leave a gap at the back. It looks like they moved the back forward to fill in the gap between cushion and back. Second look at the side guards, wha? sloppy mess. As for your foot rest if they could not build it as you requested they should have informed you **before** proceeding so that you could use your Freewheel. I think you should refuse this chair. Mike Box makes custom chairs if that is what is called for, just a suggestion.