I was afraid that would be the answer to my question.
Reason I asked is because I want to tig the quarter panel markerlight patches in. Obviously for a beginner tig welder, tig welding vertical and horizontal is a challenge to say the least.
I just finished my first practice tig weld, a 3"x6" patch. I placed the sheetmetal in a vice so I could tig welded it as though it was on the car, tig welding horizontal, and vertical.
I know I would get straighter and better looking tig welds if the sheetmetal was in more of a flat plane, even angled a little bit. You've got the Mellon on my shoulders thinking that I could jack the car up on one side. That would lean the car probably enough to aid in a better angle to tig weld.
The first practice patch was probably acceptable but, not to my standards. I have three more coupons to try again.
Here's the first horizontal tig weld.
Fusion tig welded and planished
Tig welded with filler wire
Welds dressed and hit with 80 grit. Pay no attention to the hammer marks. I need to buy a high crown hammer.