I admit I have a case of shed envy at the moment! WTG.
Remember the concrete needs two forevers to cure before you pull vehicles in or else risk cracking it, though you may not 'see' the cracks for a few years.
I hope you have an alternate pedestrian door & at least one window for emergency exits - I got momentarily trapped in 25x40 building by 2 gallons of gasoline sprayed out of a ruptured can. I didn't think to run through it before the vapors built up, er, nothing happened but I sure wished there was a back door on that shed that night...