A guitar maker's manual, also has plans for the lightbulb type bender, in case your local library has that book, which seems to be a popular choice in libraries.
The lightbulb benders have been improved on, but only at significant additional cost. If they are still going to let you have lightbulbs where you live. A lightbulb Fox was once state of the art And can be pretty much scraped together out of local materials on a weekend. However I am looking for something state of the art to replace the one I built in '98
The update to Fox's plan is in American Lutherie 104. you can basically figure out what is going on from the website pictures for the AL 104 back issue, and by looking at the the youtube video for the LMI bender. I wouldn't want to use the LMI bender if I was making my own forms. Not that it would be so bad, but at the margin not better. If I was making a new fox, I would make it open front, and probably also use heat blankets.