There are a fair few timber frame companies out there offering things like in your photo. That's gonna be the most simple way of doing things involving the least trades possible. You may even be able to get away with just a concrete pad for foundations.
If I were doing it though... I'd get a blockwork shell put up. Put a pitched roof on of the cut variety (more storage space up there). Then either cover it in waterproof render or a waterproof membrance and timber cladding. Finally get 3No. powered garage doors (I like the sectional ones from a security POV plus they look right slick

). This will be a more secure installation than an all timber one
