Well, they are right side up on Flickr & my phone. Upside-down thing seems to be an artifact of how BF renders them. You can always download & rotate in your favorite viewer.

To the OP: The thing is that you need a means of setting the chain tension. One way is to get a bike with horizontal drop outs, another is to have a bike with an eccentric bottom bracket. Both of which allow for the length of the drivetrain to be changed.

A standard chain tensioner will just barely actuate the brake mechanism enough to extend the tensioner to it's full limit. The result is tons of slack on top inconsistant, spongy performance and a broken tensioner.

I think (& somebody please correct me) that the American Bottom bracket found on many bikes with the 1 piece Ashtabula crank may be the right size for an eccentric bottom bracket. Vintage bikes with horizontal dropouts are plentiful. For your bike to work with coaster brakes, your selection is limited to these 2 options only.