Converting SR3 (and earlier) adventures to SR4? Options

[HalloranElder]

So, anyone converted any of the old adventures to SR4 yet?

Converting characters is reasonably easy, with just using the character conversion rules on the main website, but how about other stuff?

My first thought would be Target Numbers. From what I've seen so far I would probably do the following:

TN 4 or less = Threshhold 1
TN 5, 6 or 7 = Threshhold 2
TN 8 or 9 = Threshhold 3
TN 10+ = Threshhold 4

Of course, that is assuming you follow the rule of maximum threshhold is 4. If you want to go over that you just bump the threshhold by one for ever two target number (three if that two includes a number evenly divisable by 6.)

Anyone else have thoughts?

The reason I'm asking is that I'm about to start a game using the SR4 rules, but starting in 2060 (without the wireless, of course) so I can run them through the chaos. I'm also intending to run them through Brainscan and Survival of the Fittest in the lead up to System Failure.

I'm probably also going to throw a few other adventures in there as well as well as the stuff I make up on my own.