Does this seem like another site we are all too familiar with all of the sudden? All joking aside, I think that everyone has really suggested some great ideas here today.
Mike, I am glad to hear that your project is moving along. Mine for the mean time has came to a halt. My hemi harness project is really putting a drain on body work progress.
Todd, I really like the oak block suggestion and since we have a wood shop, I think I will make a set except I will use hard rock maple.
Stefan does some outstanding body work and it is very noticeable in the cars that he has posted pictures of. I would let him paint my car any day of the week.
I chemically stripped my car as well. Worked like a charm. I would avoid the chemical stripper in tight areas and other places with lots of extruded holes and lips, etc... It is difficult to get the scrapers to work in these areas.
Back on topic, we use tape as well to "strike" the line. Just be aware that sometimes when you think the tape is straight, it really isn't. Remember, gravity is working against you on the tape during application. We have a long aluminum straight edge rule that we can lay on the car to check the tape line. Good luck Mike!
You can see my project on my website (At one time, it was destined for the bone yard). I am not an expert and I don't have $50,000 to throw at a project either. So, I take my time and do it myself when time permits. Just as most of us on this site does. Hang in there and you will get it looking good.