Yes, I got 3" on the front, its been some time now and no settling yet. bilstein says #7 will net 2.7" so mileage varys a little. .
1) new control arms for sure, probably for 2" and up. stock ones will fail over time. Mopar makes an inexpensive control arm for height increases, I went with Rancho, a lot of choices out there. Look for solid, strong arms, with a quality replaceable ball joint.
2) I'm running 295/60R20s on 20 x 9 wheels with o offset. no rubs, no scrubs
3) I'm running stock front sway bar links that I will replace when they fail. I've looked into aftermarket, they are really not that longer, just have a different angle on them. The sway bar angle is not really changed, just the angle of the link mount, which will increase wear of the joint. When the front end starts to clunck, check the play.
4) Axles the same, mine are working fine. If/ when they fail I'll go with the trackmotive.
I did go with extended Core sway bar links in the rear to keep the sway bar level.
Definitely go with new control arms on the front, you'll already have it apart and it is a safety concern. Upgrade other components as they fail, I've had no issues