Welcome from Massachusetts! Hope you enjoy your time here.
It's pretty well known that you can't build from scratch what you can purchase already completed. You might be able to locate some project that's been abandoned and then make it your own!

Find / collect pictures on the net or in a magazine of cars that you enjoy the look / style of and once you have a car in your garage you can copy/emulate those characteristics that you like and build you car to look like that.

Either way, from scratch or buying a "kit" or saving a project, it isn't cheap and it takes hours. I don't know if you can do it all in 1/2 a one car garage... you'll probably have to have storage for parts somewhere .. a shed or the basement???
Some folks build'em to drive too... I just enjoy the build and being creative. I hope you enjoy "the ride"!