Me being the 'computer artist' around here, I'm asking why you didn't do all that hard work in your PC first THEN print it out all set up and ready to go, TopDog?Looks really good, though... Nice job.
you can also grab yourself a free printable grid and then use the video tutorial on how to use a grid if you don't want to go the computer route
I hope we are going to see your painting soon even the beginning stages will do.
I've heard of using a projector, but its by me I'm afraid.