Hey Luken,
The "drag bars" that I recently pulled off my bike were 28" and only had a very slight pullback. I was told they were the original 1987 bars. However I've found that I MUCH prefer the wider 34" bars I replaced them with. About 2" low rise, and just a tad more pullback. I love them on top of the stock risers that were for the flat drag bars. The extra leverage on the front end make the raked stearing much more responsive.
On your question of how much fork length; you might consider a couple of possible options besides just longer legs. Some Progressive brand springs of the proper type might hold things up a bit better with the tubes you've got now. Also, there is the possibility of using air or nitorgen in the forks to help hold up weight. However, you don't want to totally top out the forks, or you get into a situation where your suspension won't allow the tires contact with the road in some road ripple situations... Not a good thing
Barring the above suggestions and just strictly ordering longer tubes, I would guesstimate about 4" with the stock rake. You might also want to consider that the picture you chose as an example looks like the bike may have longer-than-stock rear shocks (maybe an inch or so) and that will affect geometry too (as will tire height).
Fenders similar to the ones on that bike are available through trailer building supply houses.
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