No harm in pledges, if the project doesn't pull through no money is charged, so pledge away! anyhow, 8 hours left and only about 6k missing, I think it might make it!
Nothing is easy. Go grab an off-the-shelf physics engine like ODE and try and make a 2x2x2 cube reliably fall onto another from a height of 8 with framerate independent motion. Or try and make an efficient, flexible renderer that works on most of the GPUs out there. Or heck importing animation data from modelling packages…