I know the excitement and anticipation of building a "Garage Majal" aka "Pony Palace" aka "Toy Box."
Some frustrations along the way, but well worth it!
Nothing like opening the back door (my garage is attached) and getting a big wiff of gas, oil, blood, and beer! What a High!
You should have went 12 feet high with a 10 foot high garage door. Thats what I did. 19 x 10 garage door and 12 feet 6 inch high ceiling. I went ahead and bought a extra height four post lift. I can park my 97 4x4 F150 under the 70 Mach. The wife's Escape sits nicely alongside. Of course the truck goes back outside if I ever find a 70 Convertible Mustang. The height also allowed me to build storage shelves way up and out of the way. I store extra parts and other seldom used items,rims,tires,bumpers, etc. Higher is better. Goodluck!