I recently completed my 50' x 60' x 14' shop with 29 ga metal as discussed by the OP, my cost was $1.70 ln. ft.
With the ceiling 14' up, my panels 8' 4" long and me being 76 years old, I needed a game plan that would allow me to hold the panels in place while I screwed them into the battens I had placed on 2' centers. I like things neat and done correctly, I had garage sale purchase of a laser that cast a long beam across a vertical wall. I made a 90 degree mount for it, set it on the walk boards of the rolling scaffolding. The first course took a while as I laid out screw placement pattern on the vertical wall interception with the ceiling. The beam set on the layout indicator mark cast a pattern across the panel for a easy and true screw pattern. every course there after was just a matter of lining up with the previous line of screws.
Do not assume the wall you work away from is perpendicular to the 90 degree wall or that it is straight. Mine is pole barn construction and it had a couple of waves to it. You have to establish a true 90 degree corner to start from and a straight wall or your ceiling will wave at you. I used a snap line and square corresponding corners to measure back to the starting wall. Measurements every few feet gave me the amount of wave in the wall. I found that I could hide this by using J molding to hide the difference. Using the high measurements of the "wave" I struck a straight line to set the other edge of the panels to, keeping everything straight.
To avoid scaring your panel when your screw gun slips off the screw head while trying to drill thru the metal, I used a long 1/8" punch ground to a sharp point to pierce the metal, really fast and easy, working overhead and trying to drill all those holes takes effort.
While I am on my soap box, I should mention that I used LED lighting. I experimented with 2 and 4 tube fluorescent tubes against 2 tube LED's, much brighter light from the LED's. I used the std. fluorescent fixtures but only 2 tubes instead of 4. You can buy LED's, 25 tubes for less than $100.00 delivered that use the std. ballast fixture. If for some reason you have fixtures with bad ballasts, the LED's for those is close to $10.00 each delivered.