Took the first step towards building my shop

[metric_taper]

The only bad thing I can think of now is everyone who visits my shop will see a pair of transmission jacks hanging on the wall and will assume that I am willing to repair their transmission

Or they'll want to borrow them. And then you have to fetch them when needed, and might forget where they went. Worse, they come back broken, as that's been my experience.
But you know where they are at now.