Lay out all ingredients for the nachos on a large sheet pan and cover with plenty of shredded cheese. (Go light on the BBQ sauce as you don't want to overpower it.)
Place under the broiler until the cheese is melted and the chips have started to brown.
To make the cheese sauce, melt the butter in a saucepan over medium heat. Whisk in the flour until smooth.
Slowly whisk in the milk and stir until thickened.
Remove from heat and whisk in the cheese, wine, and seasonings.
To assemble, place a tin can mold (a large tin can/coffee can with the top and bottom removed) on a large plate and pour a small amount of cheese sauce on the bottom.
Use tongs to begin added the chip mixture. When the can is about halfway filled with nachos, add more cheese sauce.
Fill with the remaining chips and top with the remaining cheese sauce.
Add your final toppings (pico de gallo, jalapenos, etc.) then slowly slide the tin can off and show off your amazing tower of nachos! Enjoy!