I THINK the point was to find a really cool LOOKING rack, one that resembles those of a bygone day...you should be able to get it on there if you use the seat tube and whatever hardware you might have or can find.

It probably will not be rocket science. It would depend if you want an older style like nine hole, etc or maybe a Hawthorne/Flyer type flat triangular wedge...you could probably go nuts with it, just use your imagination and skills and find your budget.

Might as well learn modding sooner than later, and have a blast.