Whiel renovating my house we made many many changes along the way.Drive the contractor crazy. They had to rebuild the upper tun on the new staircase because my wife didn't feel safe walking down. The bottom of the staircase has a turn but that was OK. No drawing can give you the feel of something.
Hand drawings? Are you for real? When we did our home renovation, I made several drawings for the contractor using the draw program that comes with OpenOffice. The architect did his entire design by hand.